If no files are transferred then the YADE Client should return exit code 0 if this was the expected result

Current Situation

• When setting the parameter skip_transfer=true the no files will be transferred. After executing the command an error is raised and the client terminates with exit code 99:
• To reproduce the error use

   /opt/sos-berlin.com/jade/client/bin/jade.sh \
  -operation=copy \
  -source_protocol=sftp \
  -source_user=test \
  -source_host=xxx.xxx.xxx.xxx \
  -source_dir=/home/test/ \
  -source_ssh_auth_method=password \
  -source_password=xxxxx \
  -source_port=22 \
  -target_protocol=local \
  -target_dir=/home/test/xxx \
  -verbose=0 \
  -skip_transfer=true \
  -transactional=false \
  -remove_files=false \
  -verbose=6 \
  -file_spec=^.*$
  

• This results in an error message such as:

  main INFO  11:42:09,928   (SOSDataExchangeEngine.java:623) ::printState SOSJADE_E_0100: es wurde keine Datei mit einem Namen gefunden der dem regulären Ausdruck '^.*$' entspricht. 
  

Desired Behavior

• If no files are transferred and the parameter skip_transfer=true then the YADE Client should terminated with exit code 0.