patch 8.2.2176: crash with a sequence of fold commands

Problem:    Crash with a sequence of fold commands.
Solution:   Bail out when there are no folds at all.  Add a test (Dominique
            Pellé) (closes #7515)
diff --git a/src/version.c b/src/version.c
index e9c65bc..5ed39fe 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2176,
+/**/
     2175,
 /**/
     2174,