ci: continueOnError - if the pub's matrix is empty

Author: Borda

.azure/ipynb-publish.yml

@@ -49,6 +49,7 @@ jobs:
         name: mtrx
         displayName: "Changed matrix"
       - bash: echo '$(mtrx.dirs)' | python -m json.tool
+        continueOnError: "true" # not crash if the matrix is empty
         displayName: "Show matrix"
 
       - bash: |