reinstate null assignment, something downstream seems to depend on it

src/snac/client/webui/WebUIExecutor.php

@@ -4091,7 +4091,7 @@ class WebUIExecutor {
      */
     public function recordAnalytics($input) {
         $request = ["command" => "analytics"];
-        $request["icid"] = isset($input["icid"]) ? $input["icid"] : "";
+        $request["icid"] = $input["icid"];
         $request["url"] = $input["url"];
         $request["repo_ic_id"] = $input["repo_ic_id"];
         $this->connect->query($request);