chore: fix the failing user destroy for admin (#3223)

- fix the invitee association on the user
- handle Instagram events with inbox missing

app/jobs/webhooks/instagram_events_job.rb

@@ -38,7 +38,9 @@ class Webhooks::InstagramEventsJob < ApplicationJob
 
   def create_test_text
     messenger_channel = Channel::FacebookPage.last
-    @inbox = ::Inbox.find_by!(channel: messenger_channel)
+    @inbox = ::Inbox.find_by(channel: messenger_channel)
+    return unless @inbox
+
     @contact_inbox = @inbox.contact_inboxes.where(source_id: 'sender_username').first
     unless @contact_inbox
       @contact_inbox ||= @inbox.channel.create_contact_inbox(

app/models/user.rb

@@ -78,7 +78,7 @@ class User < ApplicationRecord
   has_many :inbox_members, dependent: :destroy
   has_many :inboxes, through: :inbox_members, source: :inbox
   has_many :messages, as: :sender
-  has_many :invitees, through: :account_users, class_name: 'User', foreign_key: 'inviter_id', dependent: :nullify
+  has_many :invitees, through: :account_users, class_name: 'User', foreign_key: 'inviter_id', source: :inviter, dependent: :nullify
 
   has_many :notifications, dependent: :destroy
   has_many :notification_settings, dependent: :destroy

app/services/instagram/message_text.rb

@@ -17,6 +17,9 @@ class Instagram::MessageText < Instagram::WebhooksBaseService
                                  [@messaging[:recipient][:id], @messaging[:sender][:id]]
                                end
     inbox_channel(instagram_id)
+    # person can connect the channel and then delete the inbox
+    return if @inbox.blank?
+
     ensure_contact(contact_id)
 
     create_message

app/services/instagram/webhooks_base_service.rb

@@ -3,7 +3,7 @@ class Instagram::WebhooksBaseService
 
   def inbox_channel(instagram_id)
     messenger_channel = Channel::FacebookPage.where(instagram_id: instagram_id)
-    @inbox = ::Inbox.find_by!(channel: messenger_channel)
+    @inbox = ::Inbox.find_by(channel: messenger_channel)
   end
 
   def find_or_create_contact(user)