If you create a custom activity more than once an exception should be thrown

1. Create new project
2. Try to extend the com.tns.NativeScriptActivity, which is create by tns-core-modules
   Code:

var MyCustomActivityClass = (function (_super) {
    __extends(MyCustomActivityClass, _super);
    function MyCustomActivityClass() {
        _super.call(this);
        return global.__native(this);
    }
    MyCustomActivityClass.prototype.onCreate = function (savedInstanceState) {
     	_super.prototype.onCreate.call(this, false ? savedInstanceState : null);
     	android.util.Log.d("Sbg.Test","we got called from onCreate of custom-activity.js");
    };

    MyCustomActivityClass = __decorate([
        JavaProxy("com.tns.NativeScriptActivity")
    ], MyCustomActivityClass);

    return MyCustomActivityClass;
}(android.app.Activity));

3. Build the app for android tns build android
   Actual: A warning will be logged "Warning: there already is an extend called com.tns.NativeScriptActivity."
   Expected: An exception to be thrown https://github.com/NativeScript/android-runtime/blob/2ab7271d12d56a03e57880a2b1783b08206363ae/test-app/build-tools/static-binding-generator/src/main/java/org/nativescript/staticbindinggenerator/Generator.java#L82

P.S. In some cases the exception is thrown, but this situations are very rare.

Beginne an der verlinkten Stelle in Generator.java bei etwa Zeile 82 und verfolge, wie doppelte extends für com.tns.NativeScriptActivity behandelt werden. Führe die gemeldete Reproduktion mit einer benutzerdefinierten Activity mit tns build android aus; erledigt ist die Aufgabe, wenn die doppelte Erweiterung die erwartete Exception erzeugt, statt nur eine Warnung zu protokollieren.