- in Gerber Editor fixed adding a new aperture with code 0

- in Gerber Editor when the aperture size is 0.0 then automatically add a new aperture with code 0
- in Gerber Editor -> Eraser tool: when deleting all geometry in an aperture then the aperture is deleted too

app_Main.py

@@ -618,6 +618,7 @@ class App(QtCore.QObject):
         # self.preferencesUiManager.show_preferences_gui()
 
         self.app_units = self.options["units"]
+        self.default_units = self.defaults["units"]
 
         if self.app_units == 'MM':
             self.decimals = int(self.options['decimals_metric'])