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## Description Continuing the work from @jamilsaadeh97 to replace verbose null checks with modern [null_aware_elements](https://dart.dev/tools/linter-rules/use_null_aware_elements) syntax. This PR cleans up the remaining files not covered in the previous parts, making the code more concise. ## Related PRs - https://github.com/flutter/flutter/pull/172198 - https://github.com/flutter/flutter/pull/172306 - https://github.com/flutter/flutter/pull/172307 - https://github.com/flutter/flutter/pull/172322 ## 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], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.