skip empty log cleaner delegate class names (WAS => cleaner.CleanerChore: Can NOT create CleanerDelegate= ClassNotFoundException)

2020-07-31 00:19:49,839 WARN [master/ps0753:16000:becomeActiveMaster] cleaner.CleanerChore: Can NOT create CleanerDelegate=

java.lang.ClassNotFoundException:

at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.hadoop.hbase.master.cleaner.CleanerChore.newFileCleaner(CleanerChore.java:173)
at org.apache.hadoop.hbase.master.cleaner.CleanerChore.initCleanerChain(CleanerChore.java:155)
at org.apache.hadoop.hbase.master.cleaner.CleanerChore.<init>(CleanerChore.java:105)
at org.apache.hadoop.hbase.master.cleaner.HFileCleaner.<init>(HFileCleaner.java:139)
at org.apache.hadoop.hbase.master.cleaner.HFileCleaner.<init>(HFileCleaner.java:120)
at org.apache.hadoop.hbase.master.HMaster.startServiceThreads(HMaster.java:1424)
at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:1025)
at org.apache.hadoop.hbase.master.HMaster.startActiveMasterManager(HMaster.java:2189)
at org.apache.hadoop.hbase.master.HMaster.lambda$run$0(HMaster.java:609)
at java.lang.Thread.run(Thread.java:748)

This is the config:

<property>
<name>hbase.master.hfilecleaner.plugins</name>
<value>
</value>
<description>

<property>