patch 8.1.1491: when skipping over code a function call may cause trouble

Problem:    When skipping over code after an exception was thrown expression
            evaluation is aborted after a function call. (Ingo Karkat)
Solution:   Do not fail if not executing the expression. (closes #4507)
diff --git a/src/version.c b/src/version.c
index 75ebdc1..79d0400 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1491,
+/**/
     1490,
 /**/
     1489,