QtSupport: Use QTC_ASSERT instead of QTC_CHECK if needed

Change-Id: Ifa588c3a2f7d8b3417cf86b22a8ba013e4cba362
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Nikita Baryshnikov <nib952051@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/qtsupport/qtkitconfigwidget.cpp

@@ -108,7 +108,7 @@ QWidget *QtKitConfigWidget::buttonWidget() const
 
 static QString itemNameFor(const BaseQtVersion *v)
 {
-    QTC_CHECK(v);
+    QTC_ASSERT(v, return QString());
     QString name = v->displayName();
     if (!v->isValid())
         name = QCoreApplication::translate("QtSupport::Internal::QtKitConfigWidget", "%1 (invalid)").arg(v->displayName());