patch 8.2.4233: crash when recording and using Select mode

Problem:    Crash when recording and using Select mode.
Solution:   When deleting the last recorded character check there is something
            to delete.
diff --git a/src/version.c b/src/version.c
index 2f872e9..bc956ce 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4233,
+/**/
     4232,
 /**/
     4231,