Geometry: Meshing: Fix pep8.

src/View/Geometry/MeshingDialog.py

@@ -87,7 +87,7 @@ class MeshingDialog(PamhyrDialog):
 
     @property
     def profiles(self):
-        if self._profiles == None:
+        if self._profiles is None:
             self._profiles = list(
                 map(
                     lambda p: self._profile_name(p),