Merge branch 'bugfix-error_message_when_closing_and_reopening_molecular_viewers' into 'develop'

Bugfix error message when closing and reopening molecular viewers

See merge request !46

CHANGELOG

 * ADDED Neutron Dynamic Total Structure Factor analysis
 * ADDED User can now launch a script with qvector parameters instead of saved qvector definition
+* FIXED issue #44 An error message appeared when display, close and reopen molecular viewer and animation
 * FIXED issue #43 The weights are no more normalized with absolute sum /!\ Modifies at least CCF, DCSF and SSF job behavior
 * FIXED issue #42 Plotter units could be inconsistent
 * FIXED issue #41 Instrument resolution window froze GUI on macOS

Src/GUI/Plugins/MolecularViewerPlugin.py

@@ -252,11 +252,16 @@ class MolecularViewerPlugin(ComponentPlugin):
         self.SetFocusIgnoringChildren()
            
     def close(self):
-                
+        # Ensure unsubscription
+        self.__unsubscribe()
+        # Clear the viewer
         self.clear_universe()
 
     def __del__(self):
+        # Ensure unsubscription
+        self.__unsubscribe()
         
+    def __unsubscribe(self):
         PUBLISHER.unsubscribe(self.msg_set_selection, "msg_set_selection")
         PUBLISHER.unsubscribe(self.msg_switch_viewers_state, "msg_switch_viewers_state")
         PUBLISHER.unsubscribe(self.msg_clear_selection,'msg_clear_selection')