[NANOHUB][#308130][COM_EVENTS] Hide the show/hide button if there's no previous events
[NANOHUB][#308130][COM_EVENTS] Hide the show/hide button if there's no previous events

anthonyfuentes/hubzero-cms,zooley/hubzero-cms,zooley/hubzero-cms,zweidner/hubzero-cms,zooley/hubzero-cms,zweidner/hubzero-cms,anthonyfuentes/hubzero-cms,zweidner/hubzero-cms,zooley/hubzero-cms,anthonyfuentes/hubzero-cms,anthonyfuentes/hubzero-cms,zweidner/hubzero-cms