Fix a crash during settings update #17751
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* Adds a check whether the thread dispatcher is already null. (See code comments.) * Moves the `_settings` to only happen on the UI thread. Anything else wouldn't be thread safe. Closes #17620 ## Validation Steps Performed Not reproducible. 🚫 (cherry picked from commit e0dae59) Service-Card-Id: PVTI_lADOAF3p4s4AmhmszgSGBis Service-Version: 1.21
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(See code comments.)
_settingsto only happen on the UI thread.Anything else wouldn't be thread safe.
Closes #17620
Validation Steps Performed
Not reproducible. 🚫