Misleading error message

Calling for example

python3 generate_all_operators.py --space-mapping N1E1 --dimension 2 --quad-degree 3 3 --output foo -f Mass

results in the error message

hog.exception.HOGException: Form Mass does not match any available forms. Run --list for a list.

While not being completely off, it does not point the user to the real issue, which is that for --space-mapping N1E1 the -f Mass is only available for --dimension 3:

Space mapping	Form	Dimensions	Optimizations
N1E1	Mass	3D	1

Hence, there seems room for improvement.