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If you bind using '=' to a non-existant parent property, the compiler will throw a NON_ASSIGNABLE_MODEL_EXPRESSION exception, which is right because the model doesn't exist. This enhancement allow to specify that a binding is optional so it won't complain if the parent property is not defined. In order to mantain backward compability, the new behaviour must be specified using '=?' instead of '='. The local property will be undefined is these cases. Closes #909 Closes #1435