Method that checks whether a given string is empty. This method is the equivalent of the function string_isEmpty()

Note: The method will first trim the string before checking whether the string is empty. This means that a string with only white space is regarded as empty.

var mystring = "The quick brown fox jumps over the lazy dog";
if(mystring.isEmpty()) {
  //Do something if the string is empty.
}

This method has no parameters.