tuningSet: fix TimeLimitedLoad for zero actions

When creating a scale test that scales with number of nodes, it's
possible that for small scale clusters some of the objects are not
created, resulting in number of actions equal to zero for specific
phase. For TimeLimitedLoad it caused panic due to division by zero.

Signed-off-by: Marcel Zieba <[email protected]>

Author: marseel

clusterloader2/pkg/tuningset/time_limited.go

@@ -34,6 +34,9 @@ func newTimeLimitedLoad(params *api.TimeLimitedLoad) TuningSet {
 }
 
 func (t *timeLimitedLoad) Execute(actions []func()) {
+	if len(actions) == 0 {
+		return
+	}
 	sleepDuration := time.Duration(t.params.TimeLimit.ToTimeDuration().Nanoseconds() / int64(len(actions)))
 	var wg wait.Group
 	for i := range actions {