resoved issue #7, empty value when addProperty fires on late join

lib/Types/BasicTypes.coffee

@@ -321,8 +321,8 @@ module.exports = (HB)->
     #
     # @private
     # Include this operation in the associative lists.
-    #
-    execute: ()->
+    # @param fire_event {boolean} Whether to fire the insert-event.
+    execute: (fire_event = true)->
       if not @validateSavedOperations()
         return false
       else
@@ -374,7 +374,7 @@ module.exports = (HB)->
           @next_cl.prev_cl = @
 
         parent = @prev_cl?.getParent()
-        if parent?
+        if parent? and fire_event
           @setParent parent
           @parent.callEvent "insert", @
         super # notify the execution_listeners

lib/Types/StructuredTypes.coffee

@@ -257,8 +257,7 @@ module.exports = (HB)->
           repl_manager.parent.callEvent 'change', property_name, op
       # Call this, when the first element is inserted. Then delete the listener.
       addPropertyListener = (event, op)->
-        if op.next_cl instanceof types.Delimiter and op.prev_cl instanceof types.Delimiter
-          repl_manager.parent.callEvent 'addProperty', property_name, op
+        repl_manager.parent.callEvent 'addProperty', property_name, op
         repl_manager.deleteListener 'addProperty', addPropertyListener
       @on 'insert', addPropertyListener
       super parent
@@ -356,7 +355,10 @@ module.exports = (HB)->
         return false
       else
         @content?.setReplaceManager?(@parent)
-        ins_result = super()
+        # only fire 'insert-event' (which will result in addProperty and change events),
+        # when content is added. In case of Json, empty content means that this is not the last update,
+        # since content is deleted when 'applyDelete' was exectuted.
+        ins_result = super(@content?) # @content? whether to fire or not
         if ins_result
           if @next_cl.type is "Delimiter" and @prev_cl.type isnt "Delimiter"
             @prev_cl.applyDelete()