tdf#113874 Guard against invalid states

Change-Id: I013dd4eb81f0fbef25d9f58e27fe72d800d910ba
Reviewed-on: https://gerrit.libreoffice.org/47702Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

vcl/source/window/accessibility.cxx

@@ -139,7 +139,9 @@ css::uno::Reference< css::accessibility::XAccessible > Window::CreateAccessible(
 
 void Window::SetAccessible( const css::uno::Reference< css::accessibility::XAccessible >& x )
 {
-    assert(mpWindowImpl);
+    if (!mpWindowImpl)
+        return;
+
     mpWindowImpl->mxAccessible = x;
 }
 

vcl/source/window/window.cxx

@@ -3125,7 +3125,8 @@ const OUString& Window::GetHelpText() const
 
 void Window::SetWindowPeer( Reference< css::awt::XWindowPeer > const & xPeer, VCLXWindow* pVCLXWindow  )
 {
-    assert(mpWindowImpl);
+    if (!mpWindowImpl)
+        return;
 
     // be safe against re-entrance: first clear the old ref, then assign the new one
     mpWindowImpl->mxWindowPeer.clear();