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db/proxy: support empty values in VisitUniqueTags()

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Workaround for assertion failure in PrintUniqueTag().
This commit is contained in:
Max Kellermann 2014-09-18 17:22:31 +02:00
parent 22eb831a71
commit eeb8d0dbcd
1 changed files with 9 additions and 0 deletions
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9
src/db/plugins/ProxyDatabasePlugin.cxx
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@ -779,6 +779,15 @@ ProxyDatabase::VisitUniqueTags(const DatabaseSelection &selection,
(pair = mpd_recv_pair_tag(connection, tag_type2)) != nullptr) { (pair = mpd_recv_pair_tag(connection, tag_type2)) != nullptr) {
TagBuilder tag; TagBuilder tag;
tag.AddItem(tag_type, pair->value); tag.AddItem(tag_type, pair->value);
if (tag.IsEmpty())
/* if no tag item has been added, then the
given value was not acceptable
(e.g. empty); forcefully insert an empty
tag in this case, as the caller expects the
given tag type to be present */
tag.AddEmptyItem(tag_type);
result = visit_tag(tag.Commit(), error); result = visit_tag(tag.Commit(), error);
mpd_return_pair(connection, pair); mpd_return_pair(connection, pair);
} }