:return: True when shell can be executed.

def can_process_shell(self, entry):
        """:return: True when shell can be executed."""
        count = 0
        condition = render(entry['when'], variables=self.pipeline.variables,
                           model=self.pipeline.model, env=self.get_merged_env(include_os=True))

        if Condition.evaluate("" if condition is None else condition):
            if len(self.pipeline.options.tags) == 0:
                return True

            if 'tags' in entry:
                for tag in self.pipeline.options.tags:
                    if tag in entry['tags']:
                        count += 1

        return count > 0