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)
diff --git a/src/quickfix.c b/src/quickfix.c
index 9308d4b..999c66e 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -2813,17 +2813,21 @@
 					   (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);
diff --git a/src/version.c b/src/version.c
index 66de09e..db678ce 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    197,
+/**/
     196,
 /**/
     195,