Make preserve intermediate artifacts step treat blank as 0 (working CL now)

Author: jonsimantov

.github/workflows/cpp-packaging.yml

@@ -44,7 +44,7 @@ jobs:
               echo "::warning ::Using commit ID '${{ github.event.inputs.commitIdToPackage }}' for building and packaging SDK and tests."
             fi
           fi
-          if [[ "${{ github.event.inputs.preserveIntermediateArtifacts }}" != "0" ]]; then
+          if [[ "${{ github.event.inputs.preserveIntermediateArtifacts }}" != "0" && -n "${{ github.event.inputs.preserveIntermediateArtifacts }}" ]]; then
             echo "::warning ::Intermediate artifacts will be preserved."
           fi
 
@@ -540,7 +540,7 @@ jobs:
     name: cleanup-artifacts
     runs-on: ubuntu-latest
     needs: [merge_packages]
-    if: ${{ github.event.inputs.preserveIntermediateArtifacts == 0 && github.event.inputs.downloadPublicVersion == '' && github.event.inputs.downloadPreviousRun == '' }}
+    if: ${{ (github.event.inputs.preserveIntermediateArtifacts == 0 || github.event.inputs.preserveIntermediateArtifacts == '') && github.event.inputs.downloadPublicVersion == '' && github.event.inputs.downloadPreviousRun == '' }}
     steps:
     - uses: geekyeggo/delete-artifact@v1
       with: