Use proper expression syntax for secret check without wrapper

Co-authored-by: abernier <[email protected]>

Author: Copilot

.github/workflows/chromatic.yml

@@ -5,8 +5,8 @@ on: push
 jobs:
   chromatic:
     runs-on: ubuntu-latest
-    # Only run if the CHROMATIC_PROJECT_TOKEN secret is available
-    if: secrets.CHROMATIC_PROJECT_TOKEN
+    # Only run if the CHROMATIC_PROJECT_TOKEN secret is available  
+    if: secrets.CHROMATIC_PROJECT_TOKEN != ''
     steps:
       - uses: actions/checkout@v4
         with: