def _remove_empty_output(self):
output = []<EOL>for key in self.output_dict:<EOL><INDENT>if self.output_dict[key] is not None and '<STR_LIT>' in self.output_dict[key]:<EOL><INDENT>output.append(self.output_dict[key])<EOL><DEDENT><DEDENT>return output<EOL>
If plugins haven't been initialised and therefore not sending output or
their output is None, there is no reason to take up extra room on the
bar.