Raise error or return with context if pagerank not converge

**Is your feature request related to a problem? Please describe.**
when we run pagerank, we only can know the computation converged or not from the log. There should be a better way to notice user that pagerank has not converged.

**Describe the solution you'd like**
raise error when run app or return with context.

**Additional context**
Add any other context or screenshots about the feature request here.