#6 SecureSimpleTransferService NPE with list command

[Brian Lee]

When the list command is used and the service's transfer directory is empty, the client throws a NullPointerException. The client/service should handle this condition gracefully and not throw an NPE for a valid condition.

Steps to recreate:
delete all files from /simpleTransfer directory
execute java -jar caGridTransferService list .
view NPE