fix: omit use_did_method when none

Signed-off-by: Daniel Bluhm <[email protected]>

demo/runners/support/agent.py

@@ -1481,10 +1481,11 @@ async def get_invite(
  payload = {
  "handshake_protocols": ["rfc23"],
  "use_public_did": public_did_connections,
- "use_did_method": use_did_method,
  }
  if self.mediation:
  payload["mediation_id"] = self.mediator_request_id
+ if use_did_method:
+ payload["use_did_method"] = use_did_method
  print("Calling /out-of-band/create-invitation with:", payload, invi_params)
  invi_rec = await self.admin_POST(
  "/out-of-band/create-invitation",