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Avoid panics for empty or multibyte image usemap <!-- Please describe your changes on the following line: --> Some check were added to make sure we can call `split_at` with no risk of panics (when value is empty or the first char is multibyte). --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: --> - [x] `./mach build -d` does not report any errors - [x] `./mach test-tidy` does not report any errors - [x] These changes fix #15883 (github issue number if applicable). - [x] There are tests for these changes <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/16063) <!-- Reviewable:end -->