Break when http is not available

init.lua

@@ -31,6 +31,8 @@ local token = core.settings:get("yl_matterbridge.token") or ""
 
 local http = core.request_http_api()
 
+assert(http, "Please add yl_matterbridge to secure.http_mods")
+
 function send(user_name, message_text)
     local url = "http://" .. address .. ":" .. port .. "/api/message"
     local post_headers = {"Content-Type: application/json, "}