prefer_if_null_operators

Use the '??' operator rather than '?:' when testing for 'null'.

The analyzer produces this diagnostic when a conditional expression (using the ?: operator) is used to select a different value when a local variable is null.

The following code produces this diagnostic because the variable s is being compared to null so that a different value can be returned when s is null:

String f(String? s) => s == null ? '' : s;

Use the if-null operator instead:

String f(String? s) => s ?? '';

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