fix：修复日历开始时间为null报错

@CONTROL/日历部件/SERVICE.ts.ftl

@@ -106,8 +106,8 @@ import ${srfclassname('${_appde.getCodeName()}')}Service from '@/service/${srffi
                 });
                 // 排序
                 _data.sort((a:any, b:any)=>{
-                    let dateA = new Date(Date.parse(a.start.replace(/-/g, "/")));
-                    let dateB = new Date(Date.parse(b.start.replace(/-/g, "/")));
+                    let dateA = new Date(Date.parse(a.start?.replace(/-/g, "/")));
+                    let dateB = new Date(Date.parse(b.start?.replace(/-/g, "/")));
                     return dateA > dateB ? 1 : -1 ;
                 });
                 let result = {status: 200, data: _data};