2.1.1 :072 > a = nil
 => nil
2.1.1 :073 > if !a.nil? && !a.empty?
2.1.1 :074?>   puts "tut"
2.1.1 :075?>   end
 => nil
2.1.1 :076 > a = ""
 => ""
2.1.1 :077 > if !a.nil? && !a.empty?
2.1.1 :078?>   puts "tut"
2.1.1 :079?>   end
 => nil
2.1.1 :080 > a = "abc"
 => "abc"
2.1.1 :081 > if !a.nil? && !a.empty?
2.1.1 :082?>   puts "tut"
2.1.1 :083?>   end
tut
 => nil
2.1.1 :084 >