Reuters: German solar bellwether SolarWorld on Monday kept its 2009 sales outlook, helping European solar stocks gain, as it said cost savings had helped it offset most effects of the sector’s ongoing price slump. SolarWorld, Germany’s third-biggest solar company by revenue, unexpectedly released second-quarter key figures and said it was still sticking to its sales forecast of 1 billion euros ($1.42 billion) for 2009. “SolarWorld AG thus succeeded in largely counteracting the price …