FindLine error suppression causes error

I have this line FindLine "<script id=schema:music-album type="application/ld+json\">" 1 1 in tag source script, which according to the documentation should fail silently because of the final 1. It does however bring up a not found error and stops script execution.

Changing it to

FindLine "<script id=schema:music-album type=\"application/ld+json\">" 1 1

i.e, escaping the first quote, should fix the issue.

aha, oh well, yes that fixed it

I've realized what I was misinterpreting; and removed the erroneous post.
If you had already read, apologies for taking (?) your time.