Fix code formatting

validata_ui/views.py

@@ -133,10 +133,10 @@ class SchemaInstance:
 
 
 def extract_source_data(source: ValidataResource, schema_descriptor, preview_rows_nb=5):
-    """ Computes table preview """
+    """Computes table preview"""
 
     def stringify(val):
-        """ Transform value into string """
+        """Transform value into string"""
         return '' if val is None else str(val)
 
     header = None