Several small bug fixes... #1063
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Each commit is a small, self-contained bug fix:
Addresses failure to save when element is deleted.
Adds specific rule conditions for the AltText form.
Fixes issue where combobox display:block overrode flexbox settings.
Fixes a really stupid issue where undefined !== null and it led to a crash.
Adds additional cleanup for table_structure_misuse errors.
Removes unused devDependency.