Beijing and Tokyo’s war of words over Taiwan was expected to be bad news for Japanese businesses in China. Previous diplomatic flare-ups have brought waves of online vitriol, protests and boycotts.But at a Japanese-invested luxury department store in China’s eastern Zhejiang province, the outlet’s executives seemed largely unruffled. They are already well versed in riding out tense political situations.The billion-dollar project – which is operated by a major Japanese retail group – had a...