By Christian Kraemer BERLIN (Reuters) – German companies doing business in China are worried the Omicron coronavirus variant will trigger more strict lockdown measures from Beijing that could exacerbate supply chain problems, the DIHK Chamber of Commerce said on Tuesday. “The Chinese strategy with targeted lockdowns has been very efficient so far,” Jens Hildebrandt, DIHK’s executive board member in China, told Reuters in an interview. But the more contagious Omicron variant could challenge the zero-COVID approach by Chinese authorities, especially as more Chinese citizens will travel across th…