extmsg: search_partial: use ->isrch if available

This allows us to avoid creating ibx->{search}->{xdb} at this
spot by using an `undef' value.  This is a step towards
eliminating the innocuous "/path/to/inboxdir/xap15 has no shards"
messages introduced in commit 63d7b8ce (daemons: revamp
periodic cleanup task, 2021-09-23)

diff --git a/lib/PublicInbox/ExtMsg.pm b/lib/PublicInbox/ExtMsg.pm
index b7427b1bcbcaca89836aab1692bf149fab8f3566..c134de55d16ce68bab3f01f65241a963fa416c87 100644 (file)
--- a/lib/PublicInbox/ExtMsg.pm
+++ b/lib/PublicInbox/ExtMsg.pm
@@ -32,7 +32,7 @@ sub PARTIAL_MAX () { 100 }
 sub search_partial ($$) {
        my ($ibx, $mid) = @_;
        return if length($mid) < $MIN_PARTIAL_LEN;
-       my $srch = $ibx->search or return; # NOT ->isrch, we already try ->ALL
+       my $srch = $ibx->isrch or return;
        my $opt = { limit => PARTIAL_MAX, relevance => -1 };
        my @try = ("m:$mid*");
        my $chop = $mid;