Index: trunk/src/org/openstreetmap/josm/command/ChangeMembersCommand.java
===================================================================
--- trunk/src/org/openstreetmap/josm/command/ChangeMembersCommand.java	(revision 17241)
+++ trunk/src/org/openstreetmap/josm/command/ChangeMembersCommand.java	(revision 17242)
@@ -36,7 +36,4 @@
         this.relation = Objects.requireNonNull(relation, "relation");
         this.cmdMembers = Objects.requireNonNull(newMembers, "newMembers");
-        if (cmdMembers.isEmpty()) {
-            throw new IllegalArgumentException("Members collection is empty");
-        }
     }