lct error for the abcd matrix of a lens

[k-wolfinger]

Using the abcd / lct framework to propagate a laser pulse through a drift and lens, I get an error for the lens matrix:

• The (1,2) matrix entry may not take the value zero!
• TypeError: cannot unpack non-iterable int object

[k-wolfinger]

I'll send you the notebook showing this error

[bnash]

I created an issue in rsmath to implement this case.

[bruhwiler]

@bnash -- please prioritize the completion of this effort over other Silas project tasks

[bnash]

@dtabell will fix the issue in rsmath.