improve blissdata version errors
Improve the error messaging to bubble up the first blissdata version exception.
ImportError: cannot import name 'cached_property' from 'functools' (/usr/local/lib/python3.7/functools.py)
As for the exception itself, blissdata 1.0.1 does not support <3.8 while blissdata 1.0.0 does.
Edited by Wout De Nolf