Fix the error about appliance ID not found (#1075)

* Fix the error about appliance ID not found

* Copy appliance data before editing it

gns3server/controller/appliance.py

@@ -32,9 +32,13 @@ class Appliance:
     def __init__(self, appliance_id, data, builtin=False):
         if appliance_id is None:
             self._id = str(uuid.uuid4())
+        elif isinstance(appliance_id, uuid.UUID):
+            self._id = str(appliance_id)
         else:
             self._id = appliance_id
-        self._data = data
+        self._data = data.copy()
+        if "appliance_id" in self._data:
+            del self._data["appliance_id"]
 
         # Version of the gui before 2.1 use linked_base
         # and the server linked_clone