patch 8.2.0029: MS-Windows: crash with empty job command

Problem:    MS-Windows: crash with empty job command.
Solution:   Check for NULL result. (Yasuhiro Matsumoto, closes #5390)
diff --git a/src/version.c b/src/version.c
index ec5c7b4..7d9b3db 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    29,
+/**/
     28,
 /**/
     27,