选科查询修复

src/views/career/subject/subjectChoice.vue

@@ -188,7 +188,7 @@
       getSelectCourse(){
         getSelectCourse().then(res => {
           this.selectCourse = res.data
-          if(!res.data.course0.length) {
+          if(!res.data.course0) {
             this.gkType = 2
           }else {
             this.gkType = 1