fix: dont emit message if resolver undefined

[simonmcmillan]

With our implementation of Enigma we hit a snag where the resolver can be undefined.

This fix ensures that if the resolver is undefined Enigma wont crash.

[qlikossbuild]

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[aihazm]

Hi @simonmcmillan, (apologies for the delay...) could you please rebase on master, we are trying to figure out why the CI builds are failing

[aihazm]

Hi @simonmcmillan Even though red, we will merge the PR - the build fails due to cross-forks secrets sharing (we are not able to allow sharing secrets across forks due to obvious security reasons) - thank you for the patience

[simonmcmillan]

Awesome thankyou!