chore: Sentry Issue fixes (#4618)

Address the following sentry issues

fixes: #4616, #4617

app/models/inbox_member.rb

@@ -32,6 +32,6 @@ class InboxMember < ApplicationRecord
   end
 
   def remove_agent_from_round_robin
-    ::RoundRobin::ManageService.new(inbox: inbox).remove_agent_from_queue(user_id)
+    ::RoundRobin::ManageService.new(inbox: inbox).remove_agent_from_queue(user_id) if inbox.present?
   end
 end

lib/integrations/slack/incoming_message_builder.rb

@@ -37,7 +37,7 @@ class Integrations::Slack::IncomingMessageBuilder
     if message.present?
       SUPPORTED_MESSAGE_TYPES.include?(message[:type])
     else
-      params[:event][:files].any?
+      params.dig(:event, :files).any?
     end
   end
 

spec/models/inbox_member_spec.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe InboxMember do
+  include ActiveJob::TestHelper
+
+  describe '#DestroyAssociationAsyncJob' do
+    let(:inbox_member) { create(:inbox_member) }
+
+    # ref: https://github.com/chatwoot/chatwoot/issues/4616
+    context 'when parent inbox is destroyed' do
+      it 'enques and processes DestroyAssociationAsyncJob' do
+        perform_enqueued_jobs do
+          inbox_member.inbox.destroy!
+        end
+      end
+    end
+  end
+end