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Fixes #478
Description
it was possible that the issuer could be an empty string ('') which would indeed cause the app to crash, since our
invariant
check missed that.This is a required field, and the docs mention it, and the user must supply it in order for the functionality to work, but in the case that it's missed or forgotten, this is better than hard crashing as it was.
Steps to verify
issuer: '',
and see app hard crash