Triage crawler exceptions: Invalid comment length

[brphelps]

exceptions | summarize InvalidCommentLength = countif(outerMessage contains "invalid comment length.")

[brphelps]

When triaging, make sure to identify whether this issue should or shouldn't be happening -- if it's not truly exceptional, try to convert to a less interesting tracing method (e.g. a warning trace).

[jeffmendoza]

Looks like this is coming from a library that we use to handle zip files. Most likely an invalid zip in a package/repo we are harvesting (invalid according to the library). Seems like it should be a log and move on

Problem is the code where we get the message is here:
ghcrawler/lib/crawler.js:132
https://github.com/clearlydefined/crawler/blob/master/ghcrawler/lib/crawler.js#L132

Not sure how to filter there, or if there is somewhere else to catch these errors.