Prevent closing dialogue window when an answer is expected

apps/openmw/mwdialogue/dialoguemanagerimp.cpp

@@ -381,6 +381,10 @@ namespace MWDialogue
 
     void DialogueManager::goodbyeSelected()
     {
+        // Do not close the dialogue window if the player has to answer a question
+        if (mIsInChoice)
+            return;
+
         MWBase::Environment::get().getWindowManager()->removeGuiMode(MWGui::GM_Dialogue);
 
         // Apply disposition change to NPC's base disposition