Pull request 2129: 6644-fix-nil-deref

Updates #6644.

Co-authored-by: Eugene Burkov <E.Burkov@AdGuard.COM>

Squashed commit of the following:

commit a79f4a35f811ab85302d266839f55143afc6fff8
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Jan 17 19:53:58 2024 +0300

    all: upd chlog

commit 9106dfb65dcfbbe40a0c97964279e8c35d4c8c00
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Jan 17 19:43:34 2024 +0300

    home: fix nil deref

internal/home/home.go

@@ -360,6 +360,11 @@ func setupDNSFilteringConf(conf *filtering.Config) (err error) {
 	)
 
 	conf.EtcHosts = Context.etcHosts
+	// TODO(s.chzhen):  Use empty interface.
+	if Context.etcHosts == nil {
+		conf.EtcHosts = nil
+	}
+
 	conf.ConfigModified = onConfigModified
 	conf.HTTPRegister = httpRegister
 	conf.DataDir = Context.getDataDir()