patch 8.2.0102: messages test fails in small version

Problem:    Messages test fails in small version.
Solution:   Only use test_null_job() when available.
diff --git a/src/version.c b/src/version.c
index ba690bc..a02b198 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    102,
+/**/
     101,
 /**/
     100,