Check trial parameter reference only when experiment parameters are not empty

Author: henrysecond1

pkg/webhook/v1beta1/experiment/validator/validator.go

@@ -292,8 +292,10 @@ func (g *DefaultValidator) validateTrialTemplate(instance *experimentsv1beta1.Ex
 		trialParametersRefs[parameter.Reference] = true
 
 		// Check if parameter reference exist in experiment parameters
-		if _, ok := experimentParameterNames[parameter.Reference]; !ok {
-			return fmt.Errorf("parameter reference %v does not exist in spec.parameters: %v", parameter.Reference, instance.Spec.Parameters)
+		if len(experimentParameterNames) > 0 {
+			if _, ok := experimentParameterNames[parameter.Reference]; !ok {
+				return fmt.Errorf("parameter reference %v does not exist in spec.parameters: %v", parameter.Reference, instance.Spec.Parameters)
+			}
 		}
 
 		// Check if trialParameters contains all substitution for Trial template