Some untested conditionals in https://app.codecov.io/gh/networkx/networkx/blob/main/networkx/algorithms/core.py and I'd like to add them.

The tests will be added in https://github.com/networkx/networkx/blob/main/networkx/algorithms/tests/test_core.py

Current Behavior:
Not testing exceptions that are raised

Expected Behavior, test all conditions

Steps to reproduce, Look at coverage link above.