Discard dispatch jobs of already deleted records

app/workers/deferred_dispatch.rb

@@ -17,6 +17,7 @@ module Workers
       end
 
       Postzord::Dispatcher.build(user, object, opts).post
+    rescue ActiveRecord::RecordNotFound # The target got deleted before the job was run
     end
   end
 end

spec/workers/deferred_dispatch_spec.rb

@@ -0,0 +1,9 @@
+require 'spec_helper'
+
+describe Workers::DeferredDispatch do
+  it "handles non existing records gracefully" do
+    expect {
+      described_class.new.perform(alice.id, 'Comment', 0, {})
+    }.to_not raise_error
+  end
+end