fix: editor crashes when multi level list uses different list types #446
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Why
When the list type of a multi level list is switched the editor crashes. For example, given the following list with 2 levels:
If "1. " is changed to an unordered list, the editor crashes with a null pointer exception because it expects each list level to use the same type.
What Changed
When looking for the next index number to apply for a numbered list check if the current level has an entry.
Testing
Added a new multi-level numbered list test