Default sermon one-click filter only displays for 2+ sermons. Option to 'Show Filters' should be hidden as well

[stephenfeather]

The one-click filter only shows options when there are multiple values to
filter by:

if (count($preachers) > 1) // Only shows if 2+ preachers
if (count($series) > 1) // Only shows if 2+ series
// etc.