[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

cms/blocks.py

@@ -17,7 +17,6 @@ class ResourceBlock(blocks.StructBlock):
     detail = blocks.RichTextBlock()
 
 
-
 class CourseRunFieldBlock(blocks.FieldBlock):
     """
     Block class that allows selecting a course run