Allow null `String` for `Text` widget

[ScottPierce]

Text shouldn't throw an error if I give it a null String. It should handle that gracefully and display the same as if I gave it an empty String. Otherwise, you create more work for me, processing null Strings to empty Strings, and from what I've found so far, Dart is bad at things like that compared to Kotlin.

[sma]

You can use Text(variable ?? "") which is the same with Swift and Kotlin, I think. And once Dart NNBD support lands, you will hopefully catch most of not all "optional type" problems at compile time.

[ScottPierce]

I didn't know about the ?? operator. Thank you. That's far more convenient than what I've been doing.

[github-actions]

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