patch 8.2.0301: insufficient testing for exception handling

Problem:    Insufficient testing for exception handling and the "attention"
            prompt.
Solution:   Add test cases. (Yegappan Lakshmanan, closes #5681)

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    301,
 /**/
     300,
 /**/