[Client] Disallow opening inventory menu when not logged in

apps/openmw/mwinput/inputmanagerimp.cpp

@@ -1137,6 +1137,17 @@ namespace MWInput
         if (MyGUI::InputManager::getInstance ().isModalAny())
             return;
         
+        /*
+            Start of tes3mp addition
+            
+            Ignore attempts to open inventory if the player has not logged in on the server yet
+        */
+        if (!mwmp::Main::get().getLocalPlayer()->isLoggedIn())
+            return;
+        /*
+            End of tes3mp addition
+        */
+        
         // Toggle between game mode and inventory mode
         if(!MWBase::Environment::get().getWindowManager()->isGuiMode())
             MWBase::Environment::get().getWindowManager()->pushGuiMode(MWGui::GM_Inventory);