code: public static String notBlank(String value, String name) {
  		notNull(value, name);
  
  		if (Strings.isBlank(value)) {
  			throw new IllegalArgumentException(format("%s must not be blank", name));
  		}
  
  		return value;
  	}
docs: Check that a given string value is not blank (i.e not null, not empty and not blank).
  It throws a {@link NullPointerException} exception if value is null and throw an
  {@link java.lang.IllegalArgumentException} if value is empty or blank.
  Otherwise original value is returned
  
  @param value Value to check.
  @param name Name of parameter, it will produce an error message such as "{name} must not be null"
  or "{name} must not be blank".
  @return First parameter if it is not blank.