Fix installation of packages with the --no-dev option

        else:

            self._io.writeln('<info>Installing dependencies from lock file</>')

            locked_repository = self._locker.locked_repository(

                self.is_dev_mode()

            )

            locked_repository = self._locker.locked_repository(True)

            if not self._locker.is_fresh():

                self._io.writeln(

                if package.name not in extra_packages:

                    op.skip('Not required')

            # If the package is a dev package and dev packages

            # are not requests, we skip it

            if package.category == 'dev' and not self.is_dev_mode():

                op.skip('Dev dependencies not requested')

    def _get_extra_packages(self, repo):

        """

        Returns all packages required by extras.