fix修复群组为空

mec-application/src/main/java/com/ym/mec/student/controller/ImGroupController.java

@@ -65,7 +65,7 @@ public class ImGroupController extends BaseController {
 		}
 		ImGroup imGroup = imGroupService.get(imGroupId);
 		// 设置默认头像
-		if (Objects.nonNull(imGroup.getGroupType()) && StringUtils.isBlank(imGroup.getImg())) {
+		if (Objects.nonNull(imGroup) && Objects.nonNull(imGroup.getGroupType()) && StringUtils.isBlank(imGroup.getImg())) {
 			imGroup.setImg(imGroup.getGroupType().getAvatar());
 		}
 		return succeed(imGroup);

mec-application/src/main/java/com/ym/mec/teacher/controller/ImGroupController.java

@@ -71,7 +71,7 @@ public class ImGroupController extends BaseController {
 		}
 		ImGroup imGroup = imGroupService.get(imGroupId);
 		// 设置默认头像
-		if (Objects.nonNull(imGroup.getGroupType()) && StringUtils.isBlank(imGroup.getImg())) {
+		if (Objects.nonNull(imGroup) && Objects.nonNull(imGroup.getGroupType()) && StringUtils.isBlank(imGroup.getImg())) {
 			imGroup.setImg(imGroup.getGroupType().getAvatar());
 		}
 		return succeed(imGroup);

mec-application/src/main/java/com/ym/mec/web/controller/ImGroupController.java

@@ -75,7 +75,7 @@ public class ImGroupController extends BaseController {
 		}
 		ImGroup imGroup = imGroupService.get(imGroupId);
 		// 设置默认头像
-		if (Objects.nonNull(imGroup.getGroupType()) && StringUtils.isBlank(imGroup.getImg())) {
+		if (Objects.nonNull(imGroup) && Objects.nonNull(imGroup.getGroupType()) && StringUtils.isBlank(imGroup.getImg())) {
 			imGroup.setImg(imGroup.getGroupType().getAvatar());
 		}
 		return succeed(imGroup);