ci: fix missing branch

.github/workflows/storybook.yml

@@ -59,6 +59,8 @@ jobs:
         fi
         if pnpm --filter frontend chromatic -d storybook-static $(echo "$CHROMATIC_PARAMETER"); then
           echo "success=true" >> $GITHUB_OUTPUT
+        else
+          echo "success=false" >> $GITHUB_OUTPUT
         fi
       env:
         CHROMATIC_PROJECT_TOKEN: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}