patch 9.0.1712: missing null check in object_clear()

Problem: missing null check in object_clear()
Solution: Add null check of cl

closes: #12627

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Jia-Ju Bai <baijiaju@buaa.edu.cn>
diff --git a/src/version.c b/src/version.c
index 3a7d4bb..45f5527 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1712,
+/**/
     1711,
 /**/
     1710,