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This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request) Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request. ### Issue Link: What is the link to the issue this cherry-pick is addressing? https://github.com/flutter/flutter/issues/182243 ### Impact Description: What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping of production apps (the app crashes on launch). This information is for domain experts and release engineers to understand the consequences of saying yes or no to the cherry pick. `flutter build web` is broken for apps that use the `{{...}}` pattern in `web/index.html`. ### Changelog Description: Explain this cherry pick: * In one line that is accessible to most Flutter developers. * That describes the state prior to the fix. * That includes which platforms are impacted. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples. Don't throw an exception if no web define variable is set. ### Workaround: Is there a workaround for this issue? It's possible to workaround this issue by adding `--web-define=foo={{foo}}`. ### Risk: What is the risk level of this cherry-pick? ### Test Coverage: Are you confident that your fix is well-tested by automated tests? ### Validation Steps: What are the steps to validate that this fix works? Follow repro steps in https://github.com/flutter/flutter/issues/182243