Changes

tmf: Bug 550454: Fix invalid memory allocation in base data provider
If a trace in an experiment doesn't have events, then the zoomEntries() 
will be called with start -INFINITE and experiment end time. This will 
lead to a state system query from -INFINITE to end time which can bust 
the memory or cause illegal allocations depending on the experiment 
start time.
[Fixed] Bug 550454: OOME when adding an empty trace to an experiment
Change-Id: Ib1e5fa3e21c3ad4f49065019cc88ee839c0fe834 Signed-off-by:
Bernd Hufmann <Bernd.Hufmann@ericsson.com> Reviewed-on:
https://git.eclipse.org/r/147856 Tested-by: CI Bot Reviewed-by:
Genevieve Bastien <gbastien+lttng@versatic.net> Tested-by: Genevieve
Bastien <gbastien+lttng@versatic.net>