message: Hide intel GPU generated event row when we don't have any
  Having this empty row for captures done on AMD or when i915-perf
  support disabled doesn't make sense.
diff: @@ -310,6 +310,7 @@ void GraphRows::init( TraceEvents &trace_events )
  // Intel gpu events
  {
  + if ( !trace_events.m_i915.perf_locs.empty() )
  push_row( "i915-perf", LOC_TYPE_i915Perf, trace_events.m_i915.perf_locs.size() );
  for ( auto &req_locs : trace_events.m_i915.req_locs.m_locs.m_map )
  