code: def as_strings(self):
          
          if self.value == '' or self.value is None:
              return '{0};\n'.format(self.name)
          if '"' not in self.value and (';' in self.value or '#' in self.value):
              return '{0} "{1}";\n'.format(self.name, self.value)
          return '{0} {1};\n'.format(self.name, self.value)
docs: Return key as nginx config string.