By Victoria Waldersee BERLIN (Reuters) – BMW lowered its output forecast and warned of a highly volatile second half on Wednesday, pinpointing supplies of energy in Europe and chips worldwide as the two crucial factors to the carmaker hitting full-year earnings targets. The premium carmaker expects a solid sales increase in the second half but said total deliveries will fall short of last year’s record highs of 2.52 million across the group. Tightening sanctions on Russia, interruption of gas supply or the possibility of the war in Ukraine spreading were not factored into its forecast, it adde…