Gus Trompiz and Luiza Ilie By Gus Trompiz and Luiza Ilie PARIS, July 10 (Reuters) - After weeks of sweltering heat and drought, farmers and analysts fear France's maize crop could be the smallest in 50 years, dealing another blow to European production of the cereal after growers cut back on plantings. Grain trade association Coceral cut its outlook for European Union maize (corn) production on Friday by nearly 8% to 52.7 million metric tons, the lowest since 2007.