Clean task once model is completed

Author: pblottiere

python/plugins/db_manager/db_plugins/data_model.py

@@ -170,6 +170,7 @@ def modelDone(self):
             self.status = self.task.status
             self.model = self.task.model
             self.error = self.task.error
+        self.task = None
 
         self.done.emit()