Add a test to go through the new added code in spectrum_assignment
Add a test to go through the new added code in spectrum_assignment

Verify that there is no raised error if M=0 and the blocking attribute is there

Signed-off-by: EstherLerouzic <9136e9bbec0a09a1685b8ebbe677b6c9b26e8f18@orange.com>

Telecominfraproject/gnpy