fix(agent): getBroadcastReceivers handle null

[Ha0ris]

Resolve https://github.com/sensepost/objection/issues/590

[CDuPlooy]

Sorry for the late response on this. I don't think using a try catch is the best solution here, checking if the receivers.value is null will likely be more efficient

[Ha0ris]

Sorry for the late response on this. I don't think using a try catch is the best solution here, checking if the receivers.value is null will likely be more efficient

Should be better now.

[leonjza]

Thanks!