DEV: Update CI workflows

.github/workflows/plugin-linting.yml

@@ -39,9 +39,12 @@ jobs:
       - name: Prettier
         run: |
           yarn prettier -v
-          [ -d "assets" ] && \
+          if [ -d "assets" ]; then \
-          yarn prettier --list-different \
+            yarn prettier --list-different \
-            "assets/**/*.{scss,js,es6}"
+              "assets/**/*.{scss,js,es6}" \
+          else \
+            exit 0 \
+          fi
 
       - name: Rubocop
         run: bundle exec rubocop .