Don't crash when clicking the logo video

apps/openmw/mwgui/windowbase.cpp

@@ -58,7 +58,7 @@ void WindowBase::setVisible(bool visible)
         onClose();
 }
 
-bool WindowBase::isVisible()
+bool WindowBase::isVisible() const
 {
     return mMainWidget->getVisible();
 }

apps/openmw/mwgui/windowbase.hpp

@@ -37,7 +37,7 @@ namespace MWGui
         /// Sets the visibility of the window
         void setVisible(bool visible) override;
         /// Returns the visibility state of the window
-        bool isVisible();
+        bool isVisible() const;
 
         void center();
 

apps/openmw/mwinput/mousemanager.cpp

@@ -158,8 +158,9 @@ namespace MWInput
 
         // Don't trigger any mouse bindings while in settings menu, otherwise rebinding controls becomes impossible
         // Also do not trigger bindings when input controls are disabled, e.g. during save loading
-        if (!MWBase::Environment::get().getWindowManager()->getSettingsWindow()->isVisible()
-            && !input->controlsDisabled())
+        const MWGui::SettingsWindow* settingsWindow
+            = MWBase::Environment::get().getWindowManager()->getSettingsWindow();
+        if ((!settingsWindow || !settingsWindow->isVisible()) && !input->controlsDisabled())
             mBindingsManager->mousePressed(arg, id);
     }