Fix lint errors

src/drf_yasg/inspectors/field.py

@@ -652,7 +652,6 @@ else:
         """Hack to force ``djangorestframework_camel_case`` to camelize a plain string."""
         return next(iter(camelize({s: ''})))
 
-
     def camelize_schema(schema_or_ref, components):
         """Recursively camelize property names for the given schema using ``djangorestframework_camel_case``."""
         schema = openapi.resolve_ref(schema_or_ref, components)
@@ -667,7 +666,6 @@ else:
 
         return schema_or_ref
 
-
     class CamelCaseJSONFilter(FieldInspector):
         """Converts property names to camelCase if ``CamelCaseJSONParser`` or ``CamelCaseJSONRenderer`` are used."""