(Reuters) - Troubled low-cost African carrier Fastjet Plc said on Thursday it had enough cash to operate until Dec. 21 and that it had met the conditions for an open offer and equity refinancing to raise funds.The company in September announced a fundraising and equity refinancing aimed at increasing its equity base by at least $40 million, which will give the airline enough working capital until the end of 2019.The airline said it had cash balance of $7 million as of Wednesday, of which $6.5..