code :passwd.where { user =~ /.*/ }.uids[39] => "" : ###Ruby array query#####
How to check the array element is empty or not?
   ` passwd.where { user =~ /.*/ }.uids
=> ["0",
 "108",
 "109",
 "110",
 "111",
 "112",
 "994",
 "995",
 "1001",
 "1002",
 "",
 "65534"]`