Add a check for existence of phpcs.json.

Author: B-Interactive

.github/workflows/wpcs.yml

@@ -19,8 +19,8 @@ jobs:
             standard: 'WordPress'
             extra_args: '--report-json=./phpcs.json'
         - name: Update summary
+          if: success() && hashFiles('./phpcs.json') != ''
           run: |
             npm i -g github:10up/phpcs-json-to-md
             phpcs-json-to-md --path ./phpcs.json --output ./phpcs.md
             cat phpcs.md >> $GITHUB_STEP_SUMMARY
-          if: always()