Merge remote-tracking branch 'origin/master' into dev

# Conflicts:
#	.github/workflows/reviewNotice.yml
#	inc/spbc-scanner.php
#	inc/spbc-settings.php
#	lib/CleantalkSP/Common/Scanner/HeuristicAnalyser/HeuristicAnalyser.php
#	lib/CleantalkSP/SpbctWP/Firewall/FW.php
#	lib/CleantalkSP/SpbctWP/Scanner/ScannerQueue.php
#	readme.txt
#	security-malware-firewall.php

lib/CleantalkSP/Common/Scanner/HeuristicAnalyser/Modules/Entropy.php

@@ -47,7 +47,7 @@ public function analyse(Variables $variables)
         $encoder = new Encoder();
         $detected_unreadable_variables = [];
         foreach ( $variable_names as $variable ) {
-            if ( empty($variables_obj[$variable]) ) {
+            if ( ! isset($variables_obj[$variable][0]) ) {
                 continue;
             }
             if ( strpos($variable, '_') === 0 || strlen($variable) < 5 ) {