Pull request: dnsforward: stat empty queries

Merge in DNS/adguard-home from 5910-stats-malformed-entry to master

Squashed commit of the following:

commit ea6718daf0d65dc4b13cd08430da7fdeb6f7fd5b
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Jun 19 17:34:50 2023 +0400

    all: imp docs

commit 5341c5b351c87556b91a7f692960edc76f44b21a
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Jun 19 16:47:13 2023 +0400

    all: docs

commit 1703c421f501484a80ddcf4ca1ba24f71fa5d225
Merge: f56b62490 d26c480d0
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Jun 19 16:46:13 2023 +0400

    Merge remote-tracking branch 'origin/master' into 5910-stats-malformed-entry

    # Conflicts:
    #	CHANGELOG.md

commit f56b62490c7033e1d0b620a9cb4ba8de64862de0
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Jun 19 14:49:43 2023 +0400

    all: docs

commit be954a8cab950d038c8cf08b95158069fa0747ba
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Jun 19 14:44:05 2023 +0400

    querylog: empty queries

commit 0cda309d402156e750c7387e471da6795aa43bd6
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Jun 19 14:26:41 2023 +0400

    dnsforward: stat empty queries

CHANGELOG.md

@@ -82,10 +82,13 @@ In this release, the schema version has changed from 20 to 21.
 
 ### Fixed
 
+- Queries with the question-section target `.`, for example `NS .`, are now
+  counted in the statistics and correctly shown in the query log ([#5910]).
 - Safe Search not working with `AAAA` queries for Yandex domains ([#5913]).
 
 [#951]:  https://github.com/AdguardTeam/AdGuardHome/issues/951
 [#1577]: https://github.com/AdguardTeam/AdGuardHome/issues/1577
+[#5910]: https://github.com/AdguardTeam/AdGuardHome/issues/5910
 [#5913]: https://github.com/AdguardTeam/AdGuardHome/issues/5913
 
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