Load Issue attributes for API call (#6122)

Signed-off-by: jolheiser <john.olheiser@gmail.com>

routers/api/v1/repo/issue.go

@@ -142,7 +142,7 @@ func GetIssue(ctx *context.APIContext) {
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Issue"
-	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
+	issue, err := models.GetIssueWithAttrsByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.Status(404)