NPE in mapmode.DrawAction

[rickmastfan67]

Steps to reproduce:

1. First make sure you have the undelete plugin installed.
2. Undelete the following way: ​https://www.openstreetmap.org/way/158977006/
3. Notice that one of the nodes is mentioned that it was redacted, however, it really wasn't. (See #10102)
4. Grab a node and 'move' it to make the way appear and then hit the 'undo' button.
5. Now, select the first node in the way.
6. Hit the 'A' to start drawing from it.

What happens:
A continuous NPE starts happening till you can get JOSM to respect the 'suppress' option for errors.

What should happen:
No NPE.

I would think that if #10102 was fixed, this bug wouldn't ever be triggered.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2015-08-06 01:32:57
Last Changed Author: wiktorn
Revision: 8643
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2015-08-05 23:51:30 +0200 (Wed, 05 Aug 2015)
Last Changed Rev: 8643

Identification: JOSM/1.5 (8643 en) Windows 7 64-Bit
Memory Usage: 358 MB / 1820 MB (107 MB allocated, but free)
Java version: 1.7.0_79, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM

Dataset consistency test:
[NO DATASET] {Node id=113983539 version=9 V } is referenced by {Way id=158977006 version=7 MT> nodes=[{Node id=114048338 version=9 V lat=34.0131763,lon=-81.038849}, {Node id=113983539 version=9 V }, {Node id=114031153 version=7 V lat=34.0141196,lon=-81.0362805}, {Node id=114031130 version=10 V lat=34.0140674,lon=-81.0355949}, {Node id=114048340 version=8 M lat=34.0145112,lon=-81.0352531}, {Node id=2597719668 version=4 M lat=34.0146755,lon=-81.0343636}, {Node id=2597719656 version=3 V lat=34.0147395,lon=-81.0341519}, {Node id=2925067967 version=1 V lat=34.0147815,lon=-81.0340235}]} but not found in dataset


Plugins:
- OpeningHoursEditor (31241)
- buildings_tools (31361)
- measurement (31289)
- mirrored_download (31294)
- osmarender (31241)
- reverter (31241)
- turnrestrictions (31241)
- undelete (31241)
- utilsplugin2 (31241)

Last errors/warnings:
- W: Unable to undelete node 113,983,539. Object has likely been redacted
- E: java.lang.NullPointerException
- E: java.lang.NullPointerException

java.lang.NullPointerException
	at org.openstreetmap.josm.actions.mapmode.DrawAction.computeHelperLine(DrawAction.java:826)
	at org.openstreetmap.josm.actions.mapmode.DrawAction.mouseMoved(DrawAction.java:754)
	at java.awt.AWTEventMulticaster.mouseMoved(Unknown Source)
	at java.awt.Component.processMouseMotionEvent(Unknown Source)
	at javax.swing.JComponent.processMouseMotionEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$300(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

[Don-vip]

In 8645/josm:

fix #11756, fix #11759 - NPEs

[Don-vip]

Milestone renamed