get rid of rescue nil

[ahorek]

not a good idea, nil check should be enough

[jeremy]

Believe this is meant to catch parsing errors. Agree that blanket rescue nil is too broad, though. We can be more precise.

[ahorek]

I tested this change with 3 test suites (mail, actionmailer and redmine) wihout any regression. These methods aren't responsible for parsing, it should be just a lookup. Rescuing StandardError is too cautious, but well, still better than rescue Exception 😈

[ahorek]

rebased