fix applying directory-entry change

ml/thing.py

@@ -265,25 +265,15 @@ def __json_syn(self, freq=0.1):
             except:
                 continue
 
-    def __dir_syn(self, freq=0.1):
-        """Applies local changes to the directory entry in the cloud.
+    def __dir_syn(self):
+        """Applies local changes to the directory entry in the cloud only once.
 
-        :param freq: Frequency of the update.
-        :type freq: float
         """
-        while True:
-            # try:
-            time.sleep(freq)
-            old_dir_json = self.dir_json
-            self.to_dir_json()
-            if self.dir_json == old_dir_json:
-                continue
-            else:
-                self.dir.updateThingIDBased(
-                    thingID=self.thing_id, payload=self.dir_json
-                )
-        # except:
-        #    continue
+        self.to_dir_json()
+        if self.dir_json is not None:
+            self.dir.updateThingIDBased(
+                thingID=self.thing_id, payload=self.dir_json
+            )
 
     def __repo_syn(self, freq=0.1):
         """Applies local changes to the repository entry in the cloud.