By Tim Hepher LONDON (Reuters) -Qatar Airways has indicated that a provisional agreement to buy up to 50 Boeing 737 MAX jets has lapsed, Boeing’s rival Airbus said in a court document released on Thursday. The deal, signed in Washington in January, is part of a series of inter-locking agreements caught up in a London court dispute between Airbus and the Gulf carrier over a larger jet. Airbus requested a copy of the Boeing 737 MAX agreement after the airline brought it up as part of its bid for compensation for damage to the A350, now worth $1.4 billion. Qatar Airways initially resisted the req…