QmlJS: Fix rewriter for signal parameters

Task-number: QTCREATORBUG-7931

I had to fix a bug in the QmlJsParser.
The source location for the
propertyTypeToken was not initialized in all cases.

I also updated qmljs.g.

Change-Id: Idd0880f70578867cf5f97666aede654e00cfc744
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Christian Kamm <kamm@incasoftware.de>

src/libs/qmljs/parser/qmljsast.cpp

@@ -825,6 +825,13 @@ void UiObjectInitializer::accept0(Visitor *visitor)
     visitor->endVisit(this);
 }
 
+void UiParameterList::accept0(Visitor *visitor)
+{
+    if (visitor->visit(this)) {
+    }
+    visitor->endVisit(this);
+}
+
 void UiObjectBinding::accept0(Visitor *visitor)
 {
     if (visitor->visit(this)) {