code: static boolean isBlank(String value) {
  		if (value == null) {
  			return true;
  		}
  
  		for (char character : value.toCharArray()) {
  			if (!Character.isWhitespace(character)) {
  				return false;
  			}
  		}
  
  		return true;
  	}
docs: Check that given string is blank.
  
  @param value String to check.
  @return {@code true} if string is blank, {@code false} otherwise.