QmlJSCheck: Fix crash

Task-number: QDS-2766
Change-Id: I4b0e81b8104ac35a286a318e87e95ea022ed66f6
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/libs/qmljs/qmljscheck.cpp

@@ -1838,7 +1838,10 @@ const Value *Check::checkScopeObjectMember(const UiQualifiedId *id)
 
     const bool isListElementScope = (!m_typeStack.isEmpty() && m_typeStack.last() == "ListElement");
 
-    if (!value && !isListElementScope) {
+    if (isListElementScope)
+        return nullptr;
+
+    if (!value) {
         addMessage(ErrInvalidPropertyName, id->identifierToken, propertyName);
         return nullptr;
     }