Do not add default values to union typed parameters

This doesn't work (yet)

lib/introspector.cpp

@@ -964,8 +964,9 @@ Property *Introspector::introspectProperty(const QString& id, const QVariantMap&
     Property *member;
     member = new Property(finalId, reference, Type::Public, id, parent);
 
-    // Apply default value
-    if (data.contains("default")) {
+    // Apply default value (but not for unions)
+    bool isUnion = (dynamic_cast<UnionType*>(baseType) != nullptr);
+    if (data.contains("default") && !isUnion) {
         // Quote anything but numbers and ints
         member->setDefaultValue(quoteValue(data.value("default").toString(), baseType));
     }