Make debugging obscure save failures slightly less awful.

Change-Id: Idf2385b08b31e1a6fddefbf61f6284763c456b18
Reviewed-on: https://gerrit.libreoffice.org/54047Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

sfx2/source/doc/objserv.cxx

@@ -673,6 +673,7 @@ void SfxObjectShell::ExecFile_Impl(SfxRequest &rReq)
             catch( const task::ErrorCodeIOException& aErrorEx )
             {
                 nErrorCode = ErrCode(aErrorEx.ErrCode);
+                SAL_WARN( "sfx.doc", "Fatal IO error during save " << aErrorEx );
             }
             catch( Exception& )
             {