fix bugs

app/service/course/institution.js

@@ -424,10 +424,6 @@ class InstitutionService extends Service {
         for (let j in institutions) {
             const institution = institutions[j];
             p_institution_images[j] = ctx.classModel.CourseImages.one({ where: { type: 1, type_id: institution.id, is_cover: 1, is_video: 0 } });
-            //取不到封面图就从详情图列表里选一张
-            if (ctx.isEmpty(p_institution_images[j])) {
-                p_institution_images[j] = ctx.classModel.CourseImages.one({ where: { type: 1, type_id: institution.id, is_cover: 0, is_video: 0 } });
-            }
         }
         const institution_images = await Promise.all(p_institution_images).then(result => {//等待所有异步内容获取完成
             return result;
@@ -452,7 +448,12 @@ class InstitutionService extends Service {
             if (Number(institution.establishment_time)) {
                 tags.push('成立' + build_time + '年');
             }
-            const image = institution_images[i] ? institution_images[i].image_url : '';
+            let image = institution_images[i] ? institution_images[i].image_url : '';
+            //取不到封面图就从详情图列表里选一张
+            if (ctx.isEmpty(image)) {
+                const tmpImage = await ctx.classModel.CourseImages.one({ where: { type: 1, type_id: institution.id, is_cover: 0, is_video: 0 } });
+                image = ctx.isEmpty(tmpImage) ? '' : tmpImage.image_url;
+            }
 
             ret.push({
                 id: institution.id,