fix(client): handle empty servers in ClientSessionGroup without KeyError or leaked stacks #4182
| Job | Run time |
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| 15s | |
| 1m 50s | |
| 2m 5s | |
| 2m 0s | |
| 1m 40s | |
| 2m 11s | |
| 2m 9s | |
| 1m 6s | |
| 1m 46s | |
| 46s | |
| 1m 36s | |
| 2m 11s | |
| 1m 27s | |
| 1m 21s | |
| 1m 21s | |
| 1m 25s | |
| 1m 18s | |
| 1m 44s | |
| 1m 43s | |
| 1m 51s | |
| 1m 53s | |
| 1m 57s | |
| 1m 58s | |
| 4s | |
| 37m 37s |