upgrade to most recent chainpad

www/common/chainpad.js

@@ -1093,6 +1093,7 @@ var handleMessage = ChainPad.handleMessage = function (realtime, msgStr) {
         Common.assert(newUserInterfaceContent === realtime.userInterfaceContent);
     }
 
+    if (uncommittedPatch.operations.length) {
         // push the uncommittedPatch out to the user interface.
         for (var i = 0; i < realtime.patchHandlers.length; i++) {
             realtime.patchHandlers[i](uncommittedPatch);
@@ -1104,6 +1105,7 @@ var handleMessage = ChainPad.handleMessage = function (realtime, msgStr) {
                 }
             }
         }
+    }
     if (Common.PARANOIA) { check(realtime); }
 };