Bugfix for issue #1434

[erezsh]

Fixes #1434

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.77%. Comparing base (5016894) to head (7547758).

Files	Patch %	Lines
lark/utils.py	50.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1435 +/- ## ========================================== - Coverage 89.78% 89.77% -0.01% ========================================== Files 52 52 Lines 7811 7818 +7 ========================================== + Hits 7013 7019 +6 - Misses 798 799 +1 ``` | [Flag](https://app.codecov.io/gh/lark-parser/lark/pull/1435/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lark-parser) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/lark-parser/lark/pull/1435/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lark-parser) | `89.77% <90.90%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lark-parser#carryforward-flags-in-the-pull-request-comment) to find out more.

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[erezsh]

Not much to review but I'll follow protocol just in case.

[MegaIng]

If this is a bugfix, we should have tests that fail (sometimes) beforehand.

Although, for that we ideally had infrastructure to start a new process with different, controllable hash seeds which then execute the snippet we want to check out.

[erezsh]

Added. Anything else?