chore: Fixed coverage upload of common (#506)

* chore: Fixed coverage of common

* chore: Prevents coverage upload from failing silently

.github/workflows/main.yml

@@ -95,11 +95,12 @@ jobs:
       - name: Run unittests
         run: |
           coverage run -m pytest test/common/
-          coverage xml
+          coverage xml -o coverage-common.xml
       - uses: actions/upload-artifact@v2
         with:
           name: coverage-common
           path: ./coverage-common.xml
+          if-no-files-found: error
 
   pytest-tf:
     needs: install-tf
@@ -138,6 +139,7 @@ jobs:
         with:
           name: coverage-tf
           path: ./coverage-tf.xml
+          if-no-files-found: error
 
   pytest-torch:
     needs: install-pytorch
@@ -178,6 +180,7 @@ jobs:
         with:
           name: coverage-pytorch
           path: ./coverage-pt.xml
+          if-no-files-found: error
 
   codecov-upload:
     runs-on: ubuntu-latest