db/Count: print empty group if song without grouped tag exists

Be consistent with "list" responses.
2018-10-22 12:42:18 +02:00
parent 6c06244e83
commit 7cfe929c36
4 changed files with 18 additions and 4 deletions
--- a/doc/protocol.xml
+++ b/doc/protocol.xml
@@ -1599,6 +1599,11 @@ OK
              per-artist counts:
            </para>
            <programlisting>count group artist</programlisting>
+            <para>
+              A group with an empty value contains counts of matching
+              song which don't this group tag.  It exists only if at
+              least one such song is found.
+            </para>
          </listitem>
        </varlistentry>