Fix: Tolerate and present discovery issues

[guilatrova]

Make tryceratops tolerant to bad python files (bad syntax, etc), like for example:

def func():
    try:
        a = 1
    exc # <- Accidental line break, invalid python syntax
    ept:
        raise

Before:

No response and just the stack trace described by https://github.com/guilatrova/tryceratops/issues/11

Now:

Displays an error when found