Malformed attribute selector

[ahas...@email.com]

Attempts to update https://www.royalroad.com/fiction/85515  ("Last Command of the Witheld Arc 1: Rebirth" by aaronfrangos) consistently fail with the following error:

Malformed attribute selector at position 0
  line 1:
[id=''Edge That Cuts Anything'!A1']

The same error is generated by the release version and the latest test version of FFF under Calibre 7.12.

[Jim Miller]

The author (and/or the site) included an <a> tag with an href attribute pointing to a non-existent anchor, namely: <a href="#'Edge That Cuts Anything'!A1">...</a>

That href value is some version of 'invalid', 'ill-advised', or 'unusable', but I'm honestly not sure which.  It's not valid for an id attribute, even in HTML5 (can't have spaces), so there shouldn't ever be an id="'Edge That Cuts Anything'!A1" tag for this to link to.

The actual error comes from FFF searching for a matching anchor tag for that href. 

I've posted new test versions with additional exception handling added to ignore this sort of failure.

[ahas...@email.com]

Fix confirmed, thanks!