GUI: Raster grid manager - fix bug with menu leaving without option resulting in deleted grid

gui/src/aaregui/widgets/camera_image.py

@@ -168,7 +168,6 @@ class SampleCameraImageLabel(QGraphicsView):
             self.__state = SampleCameraImageState.IDLE
 
     def __right_click_menu(self, event):
-        self.drawing = False
 
         menu = QMenu(self)
 
@@ -199,7 +198,9 @@ class SampleCameraImageLabel(QGraphicsView):
 
         action = menu.exec_(self.mapToGlobal(event.pos()))
 
-        if action == show_coord_action:
+        if action is None:
+            return
+        elif action == show_coord_action:
             self.__show_coords = not self.__show_coords
         elif action == scale_action:
             self.__autoscale = not self.__autoscale