Fix empty string comparison issues in the codebase (#16686)

Automatic Merge

api4/config.go

@@ -181,7 +181,7 @@ func getClientConfig(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	var config map[string]string
-	if len(c.App.Session().UserId) == 0 {
+	if c.App.Session().UserId == "" {
 		config = c.App.LimitedClientConfigWithComputed()
 	} else {
 		config = c.App.ClientConfigWithComputed()