I'm not against removing those lines of code, but let me explain my reasoning for triggering the fallback bar:
* If a font file exists *and* it's empty, I don't think it's generally possible to know if a document is rendered correctly.
* Furthermore, even Adobe Reader warns that the document attached in the bug might not be displayed correctly.

@brendandahl I'm fine with this either way, so should I just make the changes you suggest?