Glithch when assigning nil as default value.

[leandrosardi]

This code:

parser = BlackStack::SimpleCommandLineParser.new(
  :description => 'This command will launch a Sinatra-based BlackStack webserver.', 
  :configuration => [{
    :name=>'ssh_password', 
    :mandatory=>false, 
    :description=>'Password to login the node via remote SSH. Either ssh_password or ssh_private_key_file must be specified.', 
    :type=>BlackStack::SimpleCommandLineParser::STRING,
    :default => nil,
  }]
)

Gets this error:

Type mismatch for the default value of ssh_password.

This other code has the same problem:

parser = BlackStack::SimpleCommandLineParser.new(
  :description => 'This command will launch a Sinatra-based BlackStack webserver.', 
  :configuration => [{
    :name=>'ssh_password', 
    :mandatory=>false, 
    :description=>'Password to login the node via remote SSH. Either ssh_password or ssh_private_key_file must be specified.', 
    :type=>BlackStack::SimpleCommandLineParser::STRING,
    :default => '',
  }]
)