Fix HoodieTableFileSystemView NPE in fetchAllStoredFileGroups

Job aborted due to stage failure: Task 3 in stage 35.0 failed 4 times, most recent failure: Lost task 3.3 in stage 35.0 (TID 32175) (10-222-33-34.lan executor 204): java.lang.NullPointerException
at java.util.ArrayList.<init>(ArrayList.java:178)
at org.apache.hudi.common.table.view.HoodieTableFileSystemView.fetchAllStoredFileGroups(HoodieTableFileSystemView.java:308)
at org.apache.hudi.common.table.view.AbstractTableFileSystemView.getAllFileGroupsIncludingReplaced(AbstractTableFileSystemView.java:976)
at org.apache.hudi.common.table.view.AbstractTableFileSystemView.getReplacedFileGroupsBefore(AbstractTableFileSystemView.java:989)
at org.apache.hudi.common.table.view.PriorityBasedFileSystemView.execute(PriorityBasedFileSystemView.java:104)
at org.apache.hudi.common.table.view.PriorityBasedFileSystemView.getReplacedFileGroupsBefore(PriorityBasedFileSystemView.java:232)
at org.apache.hudi.table.action.clean.CleanPlanner.getReplacedFilesEligibleToClean(CleanPlanner.java:441)
at org.apache.hudi.table.action.clean.CleanPlanner.getFilesToCleanKeepingLatestCommits(CleanPlanner.java:330)
at org.apache.hudi.table.action.clean.CleanPlanner.getFilesToCleanKeepingLatestCommits(CleanPlanner.java:295)
at org.apache.hudi.table.action.clean.CleanPlanner.getDeletePaths(CleanPlanner.java:493)
at org.apache.hudi.table.action.clean.CleanPlanActionExecutor.lambda$requestClean$af5da5d2$1(CleanPlanActionExecutor.java:122) at org.apache.spark.api.java.JavaPairRDD$.$anonfun$toScalaFunction$1(JavaPairRDD.scala:1070) at scala.collection.Iterator$$anon$10.next(Iterator.scala:461)
at scala.collection.Iterator.foreach(Iterator.scala:943)
at scala.collection.Iterator.foreach$(Iterator.scala:943) at scala.collection.AbstractIterator.foreach(Iterator.scala:1431) at scala.collection.generic.Growable.$plus$plus$eq(Growable.scala:62)
at scala.collection.generic.Growable.$plus$plus$eq$(Growable.scala:53)
at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:105) at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:49)
at scala.collection.TraversableOnce.to(TraversableOnce.scala:366)
at scala.collection.TraversableOnce.to$(TraversableOnce.scala:364) at scala.collection.AbstractIterator.to(Iterator.scala:1431) at scala.collection.TraversableOnce.toBuffer(TraversableOnce.scala:358) at scala.collection.TraversableOnce.toBuffer$(TraversableOnce.scala:358)
at scala.collection.AbstractIterator.toBuffer(Iterator.scala:1431)
at scala.collection.TraversableOnce.toArray(TraversableOnce.scala:345)
at scala.collection.TraversableOnce.toArray$(TraversableOnce.scala:339) at scala.collection.AbstractIterator.toArray(Iterator.scala:1431) at org.apache.spark.rdd.RDD.$anonfun$collect$2(RDD.scala:1030)
at org.apache.spark.SparkContext.$anonfun$runJob$5(SparkContext.scala:2303) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:90) at org.apache.spark.scheduler.Task.run(Task.scala:131) at org.apache.spark.executor.Executor$TaskRunner.$anonfun$run$3(Executor.scala:506) at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1480)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:509) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)