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An error is displayed when adding/removing hosts.

Traceback:

2020-03-18T07:15:38.278+0000 7fa691ad7700  0 [dashboard INFO root] Operations pending: 0
2020-03-18T07:15:38.278+0000 7fa691ad7700  0 [dashboard ERROR taskexec] Error while calling Task(ns=host/remove, md={'hostname': 'mgr0'})
Traceback (most recent call last):
  File "/ceph/src/pybind/mgr/dashboard/tools.py", line 559, in _run
    val = self.task.fn(*self.task.fn_args, **self.task.fn_kwargs)  # type: ignore
  File "/ceph/src/pybind/mgr/dashboard/controllers/host.py", line 87, in delete
    self._check_orchestrator_host_op(orch_client, hostname, False)
  File "/ceph/src/pybind/mgr/dashboard/controllers/host.py", line 97, in _check_orchestrator_host_op
    host = orch_client.hosts.get(hostname)
  File "/ceph/src/pybind/mgr/dashboard/services/orchestrator.py", line 62, in get
    hosts = [host for host in self.list() if host.name == hostname]
  File "/ceph/src/pybind/mgr/dashboard/services/orchestrator.py", line 62, in <listcomp>
    hosts = [host for host in self.list() if host.name == hostname]
AttributeError: 'HostSpec' object has no attribute 'name'