Simplify sd::Window::RequestHelp

Change-Id: I0d42c5a3133d97464d105a1ff29772c1b63a3a69
Reviewed-on: https://gerrit.libreoffice.org/66282
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

sd/source/ui/view/sdwindow.cxx

@@ -280,12 +280,7 @@ bool Window::EventNotify( NotifyEvent& rNEvt )
 
 void Window::RequestHelp(const HelpEvent& rEvt)
 {
-    if ( mpViewShell )
-    {
-        if( !mpViewShell->RequestHelp( rEvt ) )
-            vcl::Window::RequestHelp( rEvt );
-    }
-    else
+    if (!mpViewShell || !mpViewShell->RequestHelp(rEvt))
         vcl::Window::RequestHelp( rEvt );
 }