- updated the Gerber parser such that it will parse correctly Gerber files that have only one solid polygon inside with multiple clear polygons (like those generated by the Invert Tool)

AppTools/ToolInvertGerber.py

@@ -228,6 +228,11 @@ class ToolInvertGerber(AppTool):
         for poly in grb_obj.solid_geometry:
             new_solid_geometry = new_solid_geometry.difference(poly)
 
+        try:
+            __ = iter(new_solid_geometry)
+        except TypeError:
+            new_solid_geometry = [new_solid_geometry]
+
         new_options = {}
         for opt in grb_obj.options:
             new_options[opt] = deepcopy(grb_obj.options[opt])