could not drop an invalid hosts

[HarrisChu]

2 cases:

case A

(root@nebula) [(none)]> add HOSTS 127.0.0.1:17097;DROP HOSTS 127.0.0.1:17097
[ERROR (-1005)]: No hosts!

Fri, 14 Jan 2022 18:40:43 CST

case B

(root@nebula) [(none)]> add hosts "invalid":977
Execution succeeded (time spent 3877/12775 us)

Fri, 14 Jan 2022 18:49:52 CST

(root@nebula) [(none)]>
(root@nebula) [(none)]>
(root@nebula) [(none)]>
(root@nebula) [(none)]> show hosts
+-------------+-------+-----------+--------------+----------------------+------------------------+
| Host        | Port  | Status    | Leader count | Leader distribution  | Partition distribution |
+-------------+-------+-----------+--------------+----------------------+------------------------+
| "127.0.0.1" | 12097 | "ONLINE"  | 10           | "test:10"            | "test:10"              |
| "127.0.0.1" | 17097 | "ONLINE"  | 0            | "No valid partition" | "No valid partition"   |
| "invalid"   | 9779  | "OFFLINE" | 0            | "No valid partition" | "No valid partition"   |
| "invalid"   | 977   | "OFFLINE" | 0            | "No valid partition" | "No valid partition"   |
| "Total"     |       |           | 10           | "test:10"            | "test:10"              |
+-------------+-------+-----------+--------------+----------------------+------------------------+
Got 5 rows (time spent 2458/8964 us)

Fri, 14 Jan 2022 18:49:55 CST

(root@nebula) [(none)]> drop hosts "invalid":977
[ERROR (-1005)]: No hosts!

Fri, 14 Jan 2022 18:50:00 CST

when drop hosts, if there's no heartbeat yet, should drop this host successfully.