Add universal exception handler / fallback

[techalchemy]

In light of the AST parsing issues we should find a way to add universal exception handling in the AST parser to decide:

1. when we encounter an exception, whether we need to stop trying to parse via the AST (only necessary if we are holding references we can't resolve to dependencies etc) or,
2. Even if we don't encounter an exception, did we successfully resolve everything we need to figure out? I'm not sure how we will be able to tell but I have seen some cases where we are not resolving everything this way, and it's made me wonder if we should stop using the AST parser entirely

[frostming]

IMHO we only need name information in the parsing stage(for local directory requirements) and leave other metadata be read from egg-info.