Fix potential NPE when excluding last change author

James Moger

2014-10-13 70250d8ff53081eaccac24517ea96b89d27507b9

 src/test/java/com/gitblit/tests/mock/MemorySettings.java

@@ -48,6 +48,11 @@
   }

   @Override
   public boolean saveSettings() {
      return false;
   }

   @Override
   public boolean saveSettings(Map<String, String> updatedSettings) {
      return false;
   }