Fix uncaught exception when loading files with strange range defs [#1…

[pittyplatsch]

Fixes #1686

This is:

- [x] a bugfix
- [ ] a new feature

Checklist:

• Changes are covered by unit tests
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change
• Documentation is updated as necessary

Why this change is needed?

To make one fellow library user happy

[MarkBaker]

Do you have an example of what classifies as a 'strange range def'; it might be an edge-case that we can handle separately without just discarding

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
If this is still an issue for you, please try to help by debugging it further and sharing your results.
Thank you for your contributions.

[oleibman]

Closing. No update in over 2 years. The sample file in issue 1686 now loads without exception. It was very likely fixed by PR #1742 very close to when the last comment was entered on this ticket.