LONDON — European markets are expected to open in flat to negative territory as investors take stock of the volatile year during Christmas Eve's shortened trading session. The U.K.'s FTSE 100 and Germany's DAX were last seen edging below the flatline, while France's CAC was 0.1% lower according to data from IG Group.The pan-European Stoxx 600 closed 0.3% higher on Tuesday, notching a new record closing high, buoyed by Copenhagen-listed Novo Nordisk's booming share price after it gained FDA approval for the ...