code: public function setValue($value)
      {
          if (!$value) {
              if (!$this->getName()) {
                  throw new \InvalidArgumentException('Value must not be empty.');
              }
              $value = self::filterValue($this->getName());
          }
  
          $this->value = (string) $value;
  
          return $this;
      }
docs: Set the value.
  
  Used in form selects.
  
  @param string $value
  
  @return self
  @throws \InvalidArgumentException if $value AND {@link name} are empty.