when the GEFS is empty, the determine track fit to the error positon

[hanchyhill]

{ "_id" : ObjectId("5cd4d50ca263bc08d4c187ff"), "tracks" : [ { "track" : [ [ 0, [ 89.2, -21.2 ], 991, 29.32308 ], [ 6, [ 89.3, -22 ], 994, 25.20756 ], [ 12, [ 89.5, -22.7 ], 998, 21.09204 ], [ 18, [ 89.3, -23.8 ], 1000, 20.5776 ], [ 24, [ 89.5, -25.1 ], 1002, 19.03428 ], [ 30, [ 89.9, -26 ], 1003, 14.40432 ], [ 36, [ 90.6, -26.8 ], 1005, 14.40432 ], [ 42, [ 92, -28 ], 1005, 14.91876 ], [ 48, [ 94.1, -29.9 ], 1005, 14.91876 ] ], "_id" : ObjectId("5cd4d50ca263bc08d4c18800"), "fcType" : "forecast", "ensembleNumber" : NaN, "maxWind" : 29.32308 } ], "basinShort2" : "SI", "cycloneNumber" : "25", "cycloneName" : "Lorna", "ins" : "NCEP", "initTime" : ISODate("2019-04-29T06:00:00.000Z"), "maxWind" : 29.32308, "loc" : [ 89.2, -21.2 ], "tcID" : "2019042914_Lorna_25SI_GEFS", "controlIndex" : -1, "fillStatus" : 1, "createdAt" : ISODate("2019-05-10T01:34:04.068Z"), "updatedAt" : ISODate("2019-05-10T01:34:04.068Z"), "__v" : 0 }
确定性预报错误地进了track数组中，应该在detTrack属性中出现