Editing a relation after it has been removed throws an exception

[anonymous]

Steps to reproduce:

1. Select a turn restriction relation (may it is only important to select a relation)
2. Edit the relation and delete it

=> Relation is still selected although it is deleted

3. Edit the selected relation again (why does that work?)
4. Delete the relation again

=> Error below appears

Revision: 7906
Repository Root: http://josm.openstreetmap.de/svn
Relative URL: ^/trunk
Last Changed Author: Don-vip
Last Changed Date: 2014-12-29 00:13:58 +0100 (Mon, 29 Dec 2014)
Build-Date: 2014-12-29 00:11:17
URL: http://josm.openstreetmap.de/svn/trunk
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Rev: 7906

Identification: JOSM/1.5 (7906 de) Windows 7 64-Bit
Memory Usage: 606 MB / 878 MB (143 MB allocated, but free)
Java version: 1.8.0_25, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Dataset consistency test: No problems found

Plugins:
- FixAddresses (30737)
- HouseNumberTaggingTool (30762)
- OpeningHoursEditor (30737)
- PicLayer (30762)
- continuosDownload (1413902943)
- editgpx (30737)
- measurement (30737)
- pbf (30762)
- poly (30738)
- reltoolbox (30841)
- turnrestrictions (30762)
- undelete (30762)
- waydownloader (30762)

Last errors/warnings:
- W: JOSM erwartet das Objekt [Linie -14632] im Datensatz zu finden, aber es ist nicht vorhanden. Bitte melden Sie dies unter https://josm.openstreetmap.de. Es handelt sich nicht um einen kritischen Fehler. Sie sollten die Arbeit mit JOSM fortsetzen können.
- E: java.lang.Exception
- W: Unable to remove primitives from TestError [tester=org.openstreetmap.josm.data.validation.tests.UnconnectedWays$UnconnectedHighways@e101ff9a, code=1301, message=Linienende nahe anderer Straße]
- W: Unable to remove primitives from TestError [tester=org.openstreetmap.josm.data.validation.tests.UnconnectedWays$UnconnectedHighways@e101ff9a, code=1301, message=Linienende nahe anderer Straße]
- E: java.lang.IllegalArgumentException: {Relation id=4436614 version=1 MVDT]} is already deleted

java.lang.IllegalArgumentException: {Relation id=4436614 version=1 MVDT]} is already deleted
	at org.openstreetmap.josm.command.DeleteCommand.executeCommand(DeleteCommand.java:125)
	at org.openstreetmap.josm.command.SequenceCommand.executeCommand(SequenceCommand.java:53)
	at org.openstreetmap.josm.data.UndoRedoHandler.addNoRedraw(UndoRedoHandler.java:43)
	at org.openstreetmap.josm.data.UndoRedoHandler.add(UndoRedoHandler.java:69)
	at org.openstreetmap.josm.actions.mapmode.DeleteAction.deleteRelation(DeleteAction.java:333)
	at org.openstreetmap.josm.gui.dialogs.relation.GenericRelationEditor$DeleteCurrentRelationAction.run(GenericRelationEditor.java:1166)
	at org.openstreetmap.josm.gui.dialogs.relation.GenericRelationEditor$DeleteCurrentRelationAction.actionPerformed(GenericRelationEditor.java:1174)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(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$400(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 7918/josm:

see #10903 - forbids to edit deleted relations