tmf: Don't add trace column in table DP if experiment has 1 trace

The TmfEventTableDataProvider was updated for that which is used
in conjunction with Trace Compass trace server.

[Fixed] Don't add trace column in table DP if exp has 1 trace only

Signed-off-by: Hriday Panchasara <hriday.panchasara@ericsson.com>
Change-Id: I1bb75a840cdb6214c151c3b625d5903d85bf5b04
Reviewed-on: https://git.eclipse.org/r/c/tracecompass/org.eclipse.tracecompass/+/196242
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>

tmf/org.eclipse.tracecompass.tmf.core/src/org/eclipse/tracecompass/internal/provisional/tmf/core/model/events/TmfEventTableDataProvider.java

@@ -726,7 +726,9 @@ private static Iterable<ITmfEventAspect<?>> getExperimentAspects(TmfExperiment e
         ImmutableSet.Builder<ITmfEventAspect<?>> builder = new ImmutableSet.Builder<>();
 
         /* For experiments, we'll add a "trace name" aspect/column */
-        builder.add(TmfBaseAspects.getTraceNameAspect());
+        if (traces.size() > 1) {
+            builder.add(TmfBaseAspects.getTraceNameAspect());
+        }
 
         if (hasCommonTraceType(experiment)) {
             /*