fix(auth): fixes build error appearing when auth.initialize is not set

Fixes build error appearing when auth.initialize is not set.

fix #446

Author: lupas

lib/plugins/services/auth.js

@@ -1,10 +1,10 @@
 <% const { serviceMapping, serviceOptions, writeImportStatement } = options %>
 
-<% const hasOnAuthStateChangedMutation = (typeof serviceOptions.initialize.onAuthStateChangedMutation === 'string') %>
-<% const hasOnAuthStateChangedAction = (typeof serviceOptions.initialize.onAuthStateChangedAction === 'string') %>
+<% const hasOnAuthStateChangedMutation = (serviceOptions.initialize && typeof serviceOptions.initialize.onAuthStateChangedMutation === 'string') %>
+<% const hasOnAuthStateChangedAction = (serviceOptions.initialize && typeof serviceOptions.initialize.onAuthStateChangedAction === 'string') %>
 <% const hasOnAuthStateChanged = (hasOnAuthStateChangedMutation || hasOnAuthStateChangedAction) %>
-<% const onIdTokenChangedMutation = (typeof serviceOptions.initialize.onIdTokenChangedMutation === 'string') %>
-<% const onIdTokenChangedAction = (typeof serviceOptions.initialize.onIdTokenChangedAction === 'string') %> 
+<% const onIdTokenChangedMutation = (serviceOptions.initialize && typeof serviceOptions.initialize.onIdTokenChangedMutation === 'string') %>
+<% const onIdTokenChangedAction = (serviceOptions.initialize && typeof serviceOptions.initialize.onIdTokenChangedAction === 'string') %> 
 <% const hasIdTokenChanged = (onIdTokenChangedMutation || onIdTokenChangedAction) %>
 
 export default async function (session, firebase, ctx, inject) {