Currently the routing table have the isSharded verification, but after the changes of SERVER-78755 we need to also consider if there is a routing table present in order to properly route commands to appropriate shard. We could do something similar to this POC, rename the function to consider whether there is a routing table present or not.

Eventually all collections will have a proper routing table, but for now, this is an intermediary step necessary to check and modify all dependent code.