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## Description Adopts null-aware element syntax (`?x`) in `cupertino/list_tile.dart`, replacing 1 instance of the verbose `if (x != null) x!` pattern. Contributes to https://github.com/flutter/flutter/issues/172188 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] All existing and new tests are passing. [Contributor Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md [](https://www.talabat.com) [](https://github.com/search?q=org%3Aflutter+talabat&type=pullrequests) Co-authored-by: Kostia Sokolovskyi <sokolovskyi.konstantin@gmail.com>
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