patch 8.2.1802: Vim9: crash with unterminated dict

Problem:    Vim9: crash with unterminated dict. (Dhiraj Mishra)
Solution:   Return empty string instead of NULL. (closes #7084)
diff --git a/src/version.c b/src/version.c
index 80b9319..244c26d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1802,
+/**/
     1801,
 /**/
     1800,