Index: /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/TaggedSegment.java
===================================================================
--- /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/TaggedSegment.java	(revision 3257)
+++ /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/TaggedSegment.java	(revision 3258)
@@ -73,6 +73,10 @@
 			}
 		}
-		
-		return commands.size() > 1 ? new SequenceCommand("Remove keys", commands) : commands.get(0);
+		if( commands.size() == 0 )
+			return null;
+		else if( commands.size() == 1 )
+			return commands.get(0);
+		else
+			return new SequenceCommand("Remove keys", commands) ;
 	}