Check for websocket token before connecting to chat

Closes #403. Previously, a socket to the chat channel would be opened if
chat is enabled, regardless if the user is logged in or not. This patch
only allows a connection to be opened if a wsToken (websocket token) is
present, which prevents websocket errors from unauthenticated users.

src/modules/api.js

@@ -50,7 +50,7 @@ const api = {
     },
     initializeSocket (store) {
       // Set up websocket connection
-      if (!store.state.chatDisabled) {
+      if (!store.state.chatDisabled && store.state.wsToken) {
         const token = store.state.wsToken
         const socket = new Socket('/socket', {params: {token}})
         socket.connect()