Refine coding

* Adjust a few things per Hoikas' suggestion

korman/exporter/material.py

@@ -701,30 +701,29 @@ class MaterialConverter:
             layer.texture = pl_env.key
 
     def export_cubic_env(self, bo, layer, texture):
-        if texture.image == None:
-            raise ExportError("CubeMap '{}' has no cube image!".format(texture.name))
-        else:
-            width, height = texture.image.size
-
-            # Sanity check: the image here should be 3x2 faces, so we should not have any
-            #               dam remainder...
-            if width % 3 != 0:
-                raise ExportError("CubeMap '{}' width must be a multiple of 3".format(texture.image.name))
-            if height % 2 != 0:
-                raise ExportError("CubeMap '{}' height must be a multiple of 2".format(texture.image.name))
-
-            # According to PlasmaMAX, we don't give a rip about UVs...
-            layer.UVWSrc = plLayerInterface.kUVWReflect
-            layer.state.miscFlags |= hsGMatState.kMiscUseReflectionXform
-
-            # Well, this is kind of sad...
-            # Back before the texture cache existed, all the image work was offloaded
-            # to a big "finalize" save step to prevent races. The texture cache would
-            # prevent that as well, so we could theoretically slice-and-dice the single
-            # image here... but... meh. Offloading taim.
-            self.export_prepared_image(texture=texture, owner=layer, indent=3,
-                                       alpha_type=TextureAlpha.opaque, mipmap=True,
-                                       allowed_formats={"DDS"}, is_cube_map=True, tag="cubemap")
+        if texture.image is None:
+            raise ExportError(f"CubeMap '{texture.name}' has no cube image!")
+        width, height = texture.image.size
+
+        # Sanity check: the image here should be 3x2 faces, so we should not have any
+        #               dam remainder...
+        if width % 3 != 0:
+            raise ExportError("CubeMap '{}' width must be a multiple of 3".format(texture.image.name))
+        if height % 2 != 0:
+            raise ExportError("CubeMap '{}' height must be a multiple of 2".format(texture.image.name))
+
+        # According to PlasmaMAX, we don't give a rip about UVs...
+        layer.UVWSrc = plLayerInterface.kUVWReflect
+        layer.state.miscFlags |= hsGMatState.kMiscUseReflectionXform
+
+        # Well, this is kind of sad...
+        # Back before the texture cache existed, all the image work was offloaded
+        # to a big "finalize" save step to prevent races. The texture cache would
+        # prevent that as well, so we could theoretically slice-and-dice the single
+        # image here... but... meh. Offloading taim.
+        self.export_prepared_image(texture=texture, owner=layer, indent=3,
+                                   alpha_type=TextureAlpha.opaque, mipmap=True,
+                                   allowed_formats={"DDS"}, is_cube_map=True, tag="cubemap")
 
 
     def export_dynamic_env(self, bo, layer, texture, pl_class):