Pull request 2366: AG-40702-fix-cache-clear

Merge in DNS/adguard-home from AG-40702-fix-cache-clear to master

Squashed commit of the following:

commit 542a7946a9a92f64a56b1736e7411f83a42b3def
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Mar 12 18:16:35 2025 +0300

    all: fix cache clear

CHANGELOG.md

@@ -24,6 +24,8 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 ### Fixed
 
+- Clearing the DNS cache on the *DNS settings* page now includes both global cache and custom client cache.
+
 - Invalid ICMPv6 Router Advertisement messages ([#7547]).
 
 - Disabled button for autofilled login form.

internal/client/upstreammanager.go

@@ -153,7 +153,9 @@ func (m *upstreamManager) isConfigChanged(cliConf *customUpstreamConfig) (ok boo
 // upstream configuration.
 func (m *upstreamManager) clearUpstreamCache() {
 	for _, c := range m.uidToCustomConf {
-		c.proxyConf.ClearCache()
+		if c.proxyConf != nil {
+			c.proxyConf.ClearCache()
+		}
 	}
 }