(Adds details, background) BERLIN, Nov 23 (Reuters) - No one is suggesting Germany should stop trading with China, but Beijing's investments in critical sectors must be examined closely, German Economy Minister Robert Habeck said on Wednesday. "Nothing speaks against continuing to maintain economic relations with China," Habeck said at a conference organised by the Sueddeutsche Zeitung newspaper in Berlin. "It is completely impossible for the German economy, to now quickly say goodbye to it, but everything speaks against closing your eyes and hoping the situation doesn't get difficult." "That means in the critical sectors of our economy, we have to...