Optimize pr-chart-e2e.yml

Signed-off-by: ZePan110 <ze.pan@intel.com>

Author: ZePan110

.github/workflows/pr-chart-e2e.yml

@@ -65,7 +65,7 @@ jobs:
 
   helm-chart-test:
     needs: [job1]
-    if: always() && ${{ fromJSON(needs.job1.outputs.run_matrix).length != 0 }}
+    if: always() && ${{ needs.job1.outputs.run_matrix != '{"include":[]}' }}
     uses: ./.github/workflows/_helm-e2e.yml
     strategy:
       matrix: ${{ fromJSON(needs.job1.outputs.run_matrix) }}