epg timeline: Fix crash when no epg

Program terminated with signal 11, Segmentation fault.
#0  EPG::CGUIEPGGridContainer::SelectItemFromPoint (this=this@entry=0x3286970, point=..., justGrid=justGrid@entry=false) at GUIEPGGridContainer.cpp:1317
1317      if (!m_gridIndex[channel + m_channelOffset][block + m_blockOffset].item)
Merge pull request #3125 from janbar/noepg_timeline_crash

epg timeline: Fix crash when no epg
ActiveAE: fix hang in case of sink fails writing data
Merge pull request #3134 from FernetMenta/activefix

ActiveAE: fix hang in case of sink fails writing data
AE: fix coreaudio after e4ffe757f43074075749c59e8971f32649aa99a3
Merge pull request #3136 from FernetMenta/coreaudiofix

AE: fix coreaudio after e4ffe757f43074075749c59e8971f32649aa99a3