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Fix segfault with invalid map keys (#2368)

Originally reported by @mrtuxracer via HackerOne.

The changed to using even sized lists to represent maps during the
parse stage inadvertently removed certain parser-time error
guarantees. The results being that invalid keys could make their
way into the lists and cause segfaults during eval.

This PR adds parser-time error handling for the most likely error
case.

Spec https://github.com/sass/sass-spec/pull/1104

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