Fix emtpy array false presumption

Author: fsuste

lib/mina/commands.rb

@@ -35,7 +35,7 @@ def empty(stage = :default)
  end
 
  def process(path = nil)
- if path && queue[stage]
+ if path && !queue[stage].empty?
  queue[stage].unshift(%{echo "$ cd #{path}"}) if fetch(:verbose)
  %{(cd #{path} && #{queue[stage].join(' && ')} && cd -)}
  else