nl_tokens: Checks to see if passed in argument is empty .
pl_tokens: function isEmpty ( value ) { var classOfValue = classOf ( value ) , retVal ; // If value is an array or a string if ( classOfValue === _Array || classOfValue === _String ) { retVal = value . length === 0 ; } else if ( ( classOfValue === _Number && value !== 0 ) || ( classOfValue === _Function ) ) { retVal = false ; } else if ( classOfValue === _Object ) { retVal = isEmptyObj ( value ) ; } // If value is `0`, `false`, or is not set (!isset) then `value` is empty. else { retVal = ! isset ( value ) || value === 0 || value === <mask> ; } return retVal ; }