Fix some UI things.

rest/matter_controller.go

@@ -267,7 +267,9 @@ func (this *MatterController) Upload(writer http.ResponseWriter, request *http.R
 		privacy = true
 	}
 
-	request.ParseMultipartForm(32 << 20)
+	err := request.ParseMultipartForm(32 << 20)
+	this.PanicError(err)
+
 	file, handler, err := request.FormFile("file")
 	this.PanicError(err)
 	defer file.Close()

rest/matter_service.go

@@ -140,7 +140,7 @@ func (this *MatterService) Upload(file multipart.File, user *User, puuid string,
 	//判断用户自身上传大小的限制。
 	if user.SizeLimit >= 0 {
 		if written > user.SizeLimit {
-			panic("您最大只能上传" + HumanFileSize(user.SizeLimit) + "的文件")
+			this.PanicBadRequest("文件大小超出限制 " + HumanFileSize(user.SizeLimit) + ">" + HumanFileSize(written))
 		}
 	}