AudioPolicyManager: fix crash for duplicating outputs

Commit 15b40177 indroduced a crah in getNewOutputDevices()
for duplicating outputs who never have a profile.

Bug: 367117623
Test: disable in band ringtone and play a ringtone with a Bluetooth
device connected
Flag: com.android.media.audioserver.enable_strict_port_routing_checks

Change-Id: I8cb80fb5320e867b0755af9e83883267f4f5c805