Geometry: Fix pep8.

src/View/Geometry/Window.py

@@ -540,7 +540,7 @@ class GeometryWindow(PamhyrWindow):
             QSettings.UserScope, 'MyOrg'
         )
 
-        if self._study.filename != "" or self._study.filename != None:
+        if self._study.filename != "" or self._study.filename is not None:
             default_directory = os.path.basename(self._study.filename)
             current_dir = settings.value(
                 'current_directory',