Handle empty file lists in Radon analysis workflow to prevent errors

Author: josephmancuso

.github/workflows/radon-analysis.yml

@@ -14,9 +14,9 @@ jobs:
         run: pip install radon
       - name: Create Radon's reports
         run: |
-          radon cc $(git diff --name-only 2.0...HEAD) -j >cc.json
-          radon mi $(git diff --name-only 2.0...HEAD) -j >mi.json
-          radon hal $(git diff --name-only 2.0...HEAD) -j >hal.json
+          radon cc $(git diff --name-only 2.0...HEAD || echo "no_files") -j >cc.json
+          radon mi $(git diff --name-only 2.0...HEAD || echo "no_files") -j >mi.json
+          radon hal $(git diff --name-only 2.0...HEAD || echo "no_files") -j >hal.json
       - name: Comment the results on the PR
         uses: Libra-foundation/[email protected]
         with: