Fix issue for system with limited access

In case the TaskRun cannot be looked up, only the default error message was
used for the output. Especially, in automated processes with no access to
the respective cluster, this was not helpful.

Remove TaskRun dependency from the convenience error creation code.

internal/load/kubeops.go

@@ -268,7 +268,7 @@ func buildRunError(kubeAccess KubeAccess, buildRun buildv1alpha1.BuildRun) error
 		return nil
 	}
 
-	if taskRun, taskRunPod := lookUpTaskRunAndPod(kubeAccess, buildRun); taskRun != nil && taskRunPod != nil {
+	if _, taskRunPod := lookUpTaskRunAndPod(kubeAccess, buildRun); taskRunPod != nil {
 		var buf bytes.Buffer
 		var colorise = func(s string) string {
 			var h = fnv.New32()