[mythtv] PATCH:Fix All Programs to not contain showings with no category defined to show up twice

[mail2]

Hello
I did not find any directions how to create a patch file. The patch is small 
so maybe somebody can integrate it within CVS.

programs/mythfrontend/playbackbox.cpp: 1232 (Release 18.1)
from
                    if 
(gContext->GetNumSetting("UseCategoriesAsRecGroups") )
to
                    if (gContext->GetNumSetting("UseCategoriesAsRecGroups") 
&& p->category != "")