Trailing / in seg source causes issues

[schlegelp]

@jefferis and I just ran into an issue with Wei's Aedes dataset where the segmentation source in the config has a trailing / which the CAVEclient parses into table_name="":

CAVEclient/caveclient/frameworkclient.py

Line 491 in e08869f

table_name = seg_source.split("/")[-1]

Obviously, fixing the config solves the problem but perhaps the parsing could be made more robust?