PARIS (Reuters) - Dassault Aviation said on Thursday its operating income rose 14% last year, and it predicted lower net sales for 2020.The maker of business jets and French warplanes said operating income reached 765 million euros (646 million pounds) as revenues rose 44% to 7.34 billion euros.Its annual intake of new orders was up 13% at 5.69 billion euros.Analysts had on average been expecting operating profit of 588.65 million euros on revenues of 6.7 billion, according to Refinitiv..