updated examples

lib/ConnectorClass.coffee

@@ -70,11 +70,12 @@ module.exports =
   userLeft: (user)->
     delete @connections[user]
     @findNewSyncTarget()
-    for f in @connections_listeners
-      f {
-        action: "userLeft"
-        user: user
-      }
+    if @connections_listeners?
+      for f in @connections_listeners
+        f {
+          action: "userLeft"
+          user: user
+        }
 
 
   userJoined: (user, role)->
@@ -91,12 +92,13 @@ module.exports =
         # TODO: What if there are two masters? Prevent sending everything two times!
         @performSyncWithMaster user
 
-    for f in @connections_listeners
-      f {
-        action: "userJoined"
-        user: user
-        role: role
-      }
+    if @connections_listeners?
+      for f in @connections_listeners
+        f {
+          action: "userJoined"
+          user: user
+          role: role
+        }
 
   #
   # Execute a function _when_ we are connected. If not connected, wait until connected.