managed to crash the new functionality with stop_area relations

[Polyglot]

What steps will reproduce the problem?

1. I opened a stop_area relation
2. I removed all the members (they were wrong and I wanted to reuse the relation)
3. I clicked on the routes buttons

What is the expected result?

It can't really show anything, so nothing, I suppose.

I think this may also happen if a user starts to create a stop_area relation with no members in it initially.

What happens instead?

A null pointer exception

Please provide any additional information below. Attach a screenshot if possible.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-10-03 13:42:38 +0200 (Sat, 03 Oct 2020)
Revision:17084
Build-Date:2020-10-04 01:30:47
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (17084 en) Linux Mint 20
Memory Usage: 240 MB / 3990 MB (46 MB allocated, but free)
Java version: 13.0.3+3-MTS, Azul Systems, Inc., OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 1600x900 (scaling 1.0x1.0), :0.1 1920x1080 (scaling 1.0x1.0), :0.2 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 1920x1080
Best cursor sizes: 16x16 -> 16x16, 32x32 -> 32x32
Desktop environment: X-Cinnamon
fonts-noto: fonts-noto:-
VM arguments: [-Djosm.cache=<josm.cache>, -Djosm.pref=<josm.pref>, -Djosm.userdata=<josm.userdata>, -Dfile.encoding=UTF-8, -Duser.country=US, -Duser.language=en, -Duser.variant]
Program arguments: [--load-preferences=file:<josm.pref>erences-init.xml]
Dataset consistency test: No problems found

Plugins:
+ pt_assistant_route_master_visualisation (2.1.10-137-g3067d40)

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1

Last errors/warnings:
- 00010.445 E: Failed to locate image 'bus.png'
- 00365.788 E: Handled by bug report queue: java.lang.NullPointerException
- 00365.799 E: Handled by bug report queue: java.lang.NullPointerException
- 00365.855 E: Handled by bug report queue: java.lang.NullPointerException


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (18) of main
java.lang.NullPointerException
	at org.openstreetmap.josm.gui.NavigatableComponent.zoomTo(NavigatableComponent.java:843)
	at org.openstreetmap.josm.plugins.pt_assistant.gui.utils.AbstractVicinityPanel.zoomToEditorRelation(AbstractVicinityPanel.java:183)
	at org.openstreetmap.josm.plugins.pt_assistant.gui.stoparea.StopVicinityPanel.doInitialZoom(StopVicinityPanel.java:209)
	at org.openstreetmap.josm.plugins.pt_assistant.gui.utils.AbstractVicinityPanel$2.prepareToDraw(AbstractVicinityPanel.java:96)
	at org.openstreetmap.josm.gui.MapView.paint(MapView.java:479)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JViewport.paint(JViewport.java:737)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5255)
	at java.desktop/javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:246)
	at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1323)
	at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
	at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:865)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:848)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:848)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:823)
	at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:772)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1884)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[michael2402]

Both routes and vicinity view now work correctly with empty relations.