Multiple Proof: failure to issue when "proof" not in credential

[dbluhm]

2021-10-20 14:52:23,065 aries_cloudagent.core.dispatcher ERROR Handler error: Dispatcher.handle_message
Traceback (most recent call last):
  File "/home/indy/aries_cloudagent/core/dispatcher.py", line 197, in handle_message
    await handler(context, responder)
  File "/home/indy/aries_cloudagent/protocols/issue_credential/v2_0/handlers/cred_issue_handler.py", line 43, in handle
    context.message, context.connection_record.connection_id
  File "/home/indy/aries_cloudagent/protocols/issue_credential/v2_0/manager.py", line 574, in receive_credential
    cred_ex_record, cred_issue_message
  File "/home/indy/aries_cloudagent/protocols/issue_credential/v2_0/formats/ld_proof/handler.py", line 511, in receive_credential
    detail_dict["credential"].pop("proof")
KeyError: 'proof'