chore: Fix duplicates job

.github/workflows/check_duplicates.yaml

@@ -19,7 +19,9 @@ jobs:
           issues=$(gh issue list --search '${{ env.title }}' --json number,title,url)
           number=${{ env.number }}
           issues_filtered=$(echo "$issues" | jq --arg num "$number" 'map(select(.number != ($num | tonumber)))')
-          issues_markdown=$(echo "$issues_filtered" | jq -r '.[] | "- [" + .title + "](" + .url + ")"')
-          if [ "$ISSUES" != ""]; then
+          if [ "$(echo "$issues_filtered" | jq length)" -eq 0 ]; then
+            echo "No duplicates found."
+          else
+            issues_markdown=$(echo "$issues_filtered" | jq -r '.[] | "- [" + .title + "](" + .url + ")"')
             gh issue comment ${{ github.event.issue.number }} --body "@${{ env.author }}\nPossible duplication of:\n$issues_markdown"
           fi