delete only if there is comment-id

Author: iunanua

.github/workflows/pr-metadata-docs-and-deps.yml

@@ -196,6 +196,7 @@ jobs:
         body-includes: '## 📚 Documentation Check Results'
     - name: Delete existing docs comment
       uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+      if: steps.find-comment.outputs.comment-id != ''
       with:
         script: |
           github.rest.issues.deleteComment({
@@ -379,6 +380,7 @@ jobs:
         body-includes: '## 🔒 Cargo Deny Results'
     - name: Delete existing dependency check comment
       uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+      if: steps.find-comment.outputs.comment-id != ''
       with:
         script: |
           github.rest.issues.deleteComment({