pep8 cleanup + correction for external player operator return value.

release/scripts/ui/properties_animviz.py

@@ -164,11 +164,13 @@ classes = [
 # OBJECT_PT_onion_skinning
 # DATA_PT_onion_skinning
 
+
 def register():
     register = bpy.types.register
     for cls in classes:
         register(cls)
 
+
 def unregister():
     unregister = bpy.types.unregister
     for cls in classes:
@@ -176,4 +178,3 @@ def unregister():
 
 if __name__ == "__main__":
     register()
-