Fix broken current folder expansion during MR job start

sudo -u hdfs hadoop jar hadoop-mapreduce-client-jobclient-3.0.0.jar sleep -files . -m 1 -r 1 -rt 2000 -mt 2000
WARNING: Use "yarn jar" to launch YARN applications.
19/07/17 08:13:26 INFO client.ConfiguredRMFailoverProxyProvider: Failing over to rm21
19/07/17 08:13:26 INFO mapreduce.JobResourceUploader: Disabling Erasure Coding for path: /user/hdfs/.staging/job_1563349475208_0017
19/07/17 08:13:26 INFO mapreduce.JobSubmitter: Cleaning up the staging area /user/hdfs/.staging/job_1563349475208_0017
java.lang.IllegalArgumentException: Can not create a Path from an empty string
	at org.apache.hadoop.fs.Path.checkPathArg(Path.java:168)
	at org.apache.hadoop.fs.Path.<init>(Path.java:180)
	at org.apache.hadoop.fs.Path.<init>(Path.java:125)
	at org.apache.hadoop.mapreduce.JobResourceUploader.copyRemoteFiles(JobResourceUploader.java:686)
	at org.apache.hadoop.mapreduce.JobResourceUploader.uploadFiles(JobResourceUploader.java:262)
	at org.apache.hadoop.mapreduce.JobResourceUploader.uploadResourcesInternal(JobResourceUploader.java:203)
	at org.apache.hadoop.mapreduce.JobResourceUploader.uploadResources(JobResourceUploader.java:131)
	at org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:99)
	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:194)
	at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1570)
	at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1567)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1726)
	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1567)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1588)
	at org.apache.hadoop.mapreduce.SleepJob.run(SleepJob.java:273)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
	at org.apache.hadoop.mapreduce.SleepJob.main(SleepJob.java:194)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
	at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
	at org.apache.hadoop.test.MapredTestDriver.run(MapredTestDriver.java:139)
	at org.apache.hadoop.test.MapredTestDriver.main(MapredTestDriver.java:147)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.util.RunJar.run(RunJar.java:313)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:227)