Quit with open relation-editor

[bjoern_m]

What steps will reproduce the problem?

Probably, dont have time to test/reproduce

1. Open relation editor, do some changes, dont click ok
2. with no changes made, just quit JOSM
3. there would be no question whether it should be saved as no changes in the data where made
4. JOSM crashs

What is the expected result?

no crash, but a warning of open and possibly unsaved relation-things

What happens instead?

crashs and changes were not saved

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2015-06-16 21:45:58
Last Changed Author: Don-vip
Revision: 8491
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2015-06-16 23:27:08 +0200 (Tue, 16 Jun 2015)
Last Changed Rev: 8491

Identification: JOSM/1.5 (8491 de) Linux Ubuntu 14.04.3 LTS
Memory Usage: 329 MB / 592 MB (22 MB allocated, but free)
Java version: 1.7.0_79, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-7-jre:amd64-7u79-2.5.6-0ubuntu1.14.04.1

Plugins:
- FixAddresses (31241)
- HouseNumberTaggingTool (31241)
- OpeningHoursEditor (31241)
- buildings_tools (31241)
- download_along (31241)
- imagery_offset_db (31241)
- public_transport (31241)
- public_transport_layer (31220)
- todo (29154)
- undelete (31241)
- utilsplugin2 (31241)

Last errors/warnings:
- E: Fehler beim Laden des Bildes 'icons/de/sv-hp0-16.png'
- E: Fehler beim Laden des Bildes 'icons/de/sv-hp0-16.png'
- E: Fehler beim Laden des Bildes 'icons/de/sv-hp0-16.png'
- W: Could not delete archived backup file /home/bjoern/.josm/autosave/deleted_layers/Datenebene 3_20150821_003424760.osm
- E: java.lang.NullPointerException

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.dialogs.relation.MemberTable$1$1.run(MemberTable.java:139)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745)
	at java.awt.EventQueue.access$300(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:706)
	at java.awt.EventQueue$3.run(EventQueue.java:704)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:715)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

[Don-vip]

In 8677/josm:

fix #11793 - NPE