Error when loading GPX file with single point and track dynamic track coloring

[Quelbs]

What steps will reproduce the problem?

1. Start JOSM with a new profile
2. Activate "Expert mode" in settings
3. Set Track and point coloring to "Velocity"
4. Activate "Dynamic color range"
5. Open GPX with a single point

What is the expected result?

Single point should be shown

What happens instead?

Unexpected exception

This problem does not only occur in "latest" but also in "tested".

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

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<gpx version="1.1">
  <trk>
    <trkseg>
      <trkpt lat="48.1386" lon="11.573"/>
    </trkseg>
  </trk>
</gpx>

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-01-07 03:14:25 +0100 (Thu, 07 Jan 2016)
Build-Date:2016-01-07 02:34:00
Revision:9336
Relative:URL: ^/trunk

Identification: JOSM/1.5 (9336 en) Linux Ubuntu 14.04.3 LTS
Memory Usage: 266 MB / 876 MB (171 MB allocated, but free)
Java version: 1.8.0_72-internal-b05, Oracle Corporation, OpenJDK 64-Bit Server VM


Last errors/warnings:
- E: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
- E: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:653)
	at java.util.ArrayList.get(ArrayList.java:429)
	at org.openstreetmap.josm.gui.layer.gpx.GpxDrawHelper.calculateColors(GpxDrawHelper.java:254)
	at org.openstreetmap.josm.gui.layer.gpx.GpxDrawHelper.drawAll(GpxDrawHelper.java:201)
	at org.openstreetmap.josm.gui.layer.GpxLayer.paint(GpxLayer.java:280)
	at org.openstreetmap.josm.gui.MapView.paintLayer(MapView.java:638)
	at org.openstreetmap.josm.gui.MapView.paint(MapView.java:706)
	at javax.swing.JComponent.paintChildren(JComponent.java:889)
	at javax.swing.JComponent.paint(JComponent.java:1065)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:290)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1272)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5158)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4969)
	at javax.swing.RepaintManager$4.run(RepaintManager.java:831)
	at javax.swing.RepaintManager$4.run(RepaintManager.java:814)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:789)
	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:738)
	at javax.swing.RepaintManager.access$1200(RepaintManager.java:64)
	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1732)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[simon04]

In 9338/josm:

fix #12312 - Error when loading GPX file with single point and track dynamic track coloring

Regression of r9234.

[Don-vip]

In 9339/josm:

see #12312 - add non-regression unit test

[simon04]

Ticket #12375 has been marked as a duplicate of this ticket.