do not ignore empty execution

Author: cloud-fan

sql/core/src/main/scala/org/apache/spark/sql/execution/ui/SQLListener.scala

@@ -314,8 +314,6 @@ class SQLListener(conf: SparkConf) extends SparkListener with Logging {
       if (executionUIData.isFailed) {
         failedExecutions += executionUIData
         trimExecutionsIfNecessary(failedExecutions)
-      } else if (executionUIData.jobs.isEmpty && executionUIData.accumulatorMetrics.isEmpty) {
-        // ignore the executions which don't have associated Spark jobs and metrics.
       } else {
         completedExecutions += executionUIData
         trimExecutionsIfNecessary(completedExecutions)