updated for version 7.3.197

Problem:    When a QuickfixCmdPost event removes all errors, Vim still tries
            to jump to the first error, resulting in E42.
Solution:   Get the number of error after the autocmd event. (Mike Lundy)

src/quickfix.c

@@ -2813,17 +2813,21 @@ ex_make(eap)
 					   (eap->cmdidx != CMD_grepadd
 					    && eap->cmdidx != CMD_lgrepadd),
 					   *eap->cmdlinep);
+    if (wp != NULL)
+	qi = GET_LOC_LIST(wp);
 #ifdef FEAT_AUTOCMD
     if (au_name != NULL)
+    {
 	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
 					       curbuf->b_fname, TRUE, curbuf);
+	if (qi->qf_curlist < qi->qf_listcount)
+	    res = qi->qf_lists[qi->qf_curlist].qf_count;
+	else
+	    res = 0;
+    }
 #endif
     if (res > 0 && !eap->forceit)
-    {
-	if (wp != NULL)
-	    qi = GET_LOC_LIST(wp);
 	qf_jump(qi, 0, 0, FALSE);		/* display first error */
-    }
 
     mch_remove(fname);
     vim_free(fname);

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    197,
 /**/
     196,
 /**/