Update similarIssues.yml to not show 'fail' when no similar issues fo…

…und (#4042)

## Summary of the Pull Request
Added an if statement to similarIssues.yml so that the logic can be
updated to not show as 'failure' when no similar issue is found.

## References and Relevant Issues
None

## Detailed Description of the Pull Request / Additional comments
Small change only

## Validation Steps Performed

## PR Checklist
- [x] Closes
craigloewen-msft/GitGudSimilarIssues#33

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.github/workflows/similarissues.yml

@@ -21,6 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       issues: write
+    if: needs.getSimilarIssues.outputs.message != ''
     steps:
       - name: Add comment
         run: gh issue comment "$NUMBER" --repo "$REPO" --body "$BODY"