Masking Strategies Failing on Null/Non Strings

[pattisdr]

Bug Description

Hmac, hash, and likely other masking strategies are failing when a null value is passed in in a list, as well as when a non-string value is passed in.

Steps to Reproduce

1. Do this...
2. Then This...

Expected behavior

Null values should be returned as null.
For non-string, I think it makes sense to turn into a string.

Screenshots

If applicable, add screenshots to help explain your problem.

Environment

• Version:
• OS:
• Python Version:
• Docker Version:

Additional context

Add any other context about the problem here.

[seanpreston]

Nice catch @pattisdr thanks!