do nothing if there are no changes in python files

Author: mnschmit

action.yml

@@ -28,19 +28,22 @@ runs:
         list-files: shell
 
     - name: flake8
+      if: steps.changes.outputs.addedOrModifiedPython == 'true'
       uses: reviewdog/action-flake8@v3
       with:
         flake8_args: ${{ steps.changes.outputs.addedOrModifiedPython_files }}
         reporter: ${{ steps.reporter-check.outputs.reporter }}
 
     - name: mypy
+      if: steps.changes.outputs.addedOrModifiedPython == 'true'
       uses: tsuyoshicho/[email protected]
       with:
         target: ""
         mypy_flags: ${{ steps.changes.outputs.addedOrModifiedPython_files }}
         reporter: ${{ steps.reporter-check.outputs.reporter }}
 
     - name: pylint
+      if: steps.changes.outputs.addedOrModifiedPython == 'true'
       uses: dciborow/[email protected]
       with:
         glob_pattern: ${{ steps.changes.outputs.addedOrModifiedPython_files }}