handle gtk import in pyinstaller binary properly

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@628 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/Gui/common.py

@@ -80,6 +80,9 @@ def import_gtk_carefully():
         except NameError:
             # GTK is probably not installed - the next import will fail
             pass
+        except WindowsError:
+            # this happens with pyinstaller binaries - just ignore it
+            pass
         else:
             # add the new path to the PATH environment variable
             if "PATH" in os.environ: