[mer][qtnetwork] Treat missing connmanManager as completed update. Co…

…ntributes to JB#39853

Previous if request scan failed, update was treated as completed. Align
with that behaviour and treat also missing connman interface as completed
update.

src/plugins/bearer/connman/qconnmanengine.cpp

@@ -230,7 +230,7 @@ void QConnmanEngine::requestUpdate()
 
 void QConnmanEngine::doRequestUpdate()
 {
-    if (connmanManager && connmanManager->requestScan("wifi"))
+    if (!connmanManager || !connmanManager->requestScan("wifi"))
         Q_EMIT updateCompleted();
 }