Parameter overwrite_files=no for existing files should not result in misleading error message

Current Situation

• Using the following profile
  simple_sftp.ini

  [sftp_receive]
  log_filename=c:\temp\jade.log
  source_host=wilma.sos
  source_protocol=sftp
  source_ssh_auth_method=password
  source_user=test
  source_password=12345
  target_host=localhost
  target_protocol=local
  file_path=test.xml
  operation=copy
  target_dir=c:\temp
  source_dir=.
  overwrite_files=no
  

• if c:\temp\test.xml already exists then the following error is raised:

  es wurde keine Datei mit einem Namen gefunden der dem regulären Ausdruck '^.*$' entspricht
  

Desired Behavior

• JADE should provide an informative error message that points to the reason why a file could not be overwritten
  • e.g. write protection enabled
  • e.g. settings active for force_files=true and overwrite_files=yes
• No error should be raised if force_files=false