chore: add failsafe check for gRPC#2163

ohmayr merged 1 commit intoasync-rest-support-in-gapicsgoogleapis/gapic-generator-python:async-rest-support-in-gapicsfrom

raise-error-for-grpcgoogleapis/gapic-generator-python:raise-error-for-grpcCopy head branch name to clipboard