修复床垫清单索引超出范围报错

JLHHJSvr/Helper/BedNetHelper.cs

@@ -2150,7 +2150,7 @@ namespace JLHHJSvr.Helper
                 {
                     ls_t_name = GetSpringName(springList[0].springid.Value);
                     int pos = ls_t_name.IndexOf('/');
-                    if (pos > 0)
+                    if (pos > 0 && springList.Count > 1)
                     {
                         ls_left = ls_t_name.Substring(0, pos);
                         ls_right = ls_t_name.Substring(pos);