Unhandled ExtractsRef::RefExtractor::InvalidPathError in Snippets::BlobsActions

Sentry error: https://new-sentry.gitlab.net/organizations/gitlab/issues/1850709

Backtrace

ExtractsRef::RefExtractor::InvalidPathError: ExtractsRef::RefExtractor::InvalidPathError (ExtractsRef::RefExtractor::InvalidPathError)
  from lib/extracts_ref/ref_extractor.rb:61:in `extract!'
  from app/controllers/concerns/snippets/blobs_actions.rb:23:in `blob'

Problem

BlobsActions class is missing a handler for ExtractsRef::RefExtractor::InvalidPathError

Solution

Handle an exception and return a 404 error when provided reference is incorrect.