[nvme-cli] Internal error while add/deleting host if host argument id not provided

[sunilkumarn417]

Internal error is noticed when host added/deleted without "--host" option.

# podman run quay.io/ceph/nvmeof-cli:v0.0.7 --server-address 10.0.211.32 --server-port 5500 host add -n nqn.2016-06.io.spdk:test_cli 
Failure adding host  to nqn.2016-06.io.spdk:test_cli: Internal error

[2024-01-11 13:09:59.303537] subsystem.c:  85:nvmf_valid_nqn: *ERROR*: Invalid NQN "": length 0 < min 11
ERROR:control.grpc:Failure adding host  to nqn.2016-06.io.spdk:test_cli:
request:
{
  "nqn": "nqn.2016-06.io.spdk:test_cli",
  "host": "",
  "method": "nvmf_subsystem_add_host",
  "req_id": 16
}
Got JSON-RPC error response
response:
{
  "code": -32603,
  "message": "Internal error"
}

# podman run quay.io/ceph/nvmeof-cli:v0.0.7 --server-address 10.0.211.32 --server-port 5500 host del -n nqn.2016-06.io.spdk:test_cli
Failure removing host  access from nqn.2016-06.io.spdk:test_cli: Internal error

INFO:control.grpc:Received request to remove host  access from nqn.2016-06.io.spdk:test_cli, context: <grpc._server._Context object at 0x7fc1dbda97c0>
ERROR:control.grpc:Failure removing host  access from nqn.2016-06.io.spdk:test_cli:
request:
{
  "nqn": "nqn.2016-06.io.spdk:test_cli",
  "host": "",
  "method": "nvmf_subsystem_remove_host",
  "req_id": 21
}
Got JSON-RPC error response
response:
{
  "code": -32603,
  "message": "Internal error"
}
DEBUG:control.state:omap_key removed: host_nqn.2016-06.io.spdk:test_cli_
DEBUG:control.state:Update complete.
ERROR:control.grpc:Error persisting host  access removal:
'host_nqn.2016-06.io.spdk:test_cli_'