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04271124bb
Removed some sources of panic from script thread. <!-- Please describe your changes on the following line: --> **This PR needs some thought!** It removes some sources of panic from script_thread.rs, caused by pipeline lookup failure. It's incomplete, as there are some uses of `get_browsing_context` elsewhere in the code. --- <!-- 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 #11693 and #11685 (and probably some other intermittents) - [X] These changes do not require tests because it is fixing intermittent panic <!-- 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="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11695) <!-- Reviewable:end -->
