Fix bug caused by having FTPClient.listFiles() call FTPClient.listFiles("") instead of passing in a null PR:  25668
Fix bug caused by having FTPClient.listFiles() call
FTPClient.listFiles("") instead
of passing in a null
PR:  25668


git-svn-id: 8e7fc3cb9b5e494b5390f56e4b66b18dc2b2e92b@139510 13f79535-47bb-0310-9956-ffa450edef68

mohanaraosv/commons-net,codolutions/commons-net,codolutions/commons-net,apache/commons-net,mohanaraosv/commons-net,apache/commons-net