dahn f2f3f71e74
Enhance NFS mount option check for empty response
```
ERROR: test suite for <class 'tests.component.maint.test_primary_storage_nfsmountopts_kvm.TestNFSMountOptsKVM'>
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/nose/suite.py", line 210, in run
    self.setUp()
  File "/usr/local/lib/python3.9/site-packages/nose/suite.py", line 293, in setUp
    self.setupContext(ancestor)
  File "/usr/local/lib/python3.9/site-packages/nose/suite.py", line 316, in setupContext
    try_run(context, names)
  File "/usr/local/lib/python3.9/site-packages/nose/util.py", line 471, in try_run
    return func()
  File "/marvin/tests/component/maint/test_primary_storage_nfsmountopts_kvm.py", line 46, in setUpClass
    cls.version = cls.getNFSMountOptionForPool(cls, "vers", cls.storage_pool.id)
  File "/marvin/tests/component/maint/test_primary_storage_nfsmountopts_kvm.py", line 115, in getNFSMountOptionForPool
    stat = nfsstat[0]
IndexError: list index out of range
```

because 

```
shClient: DEBUG: {Cmd: nfsstat -m | sed -n '/e08df33d-d187-3c1c-88f4-10c69669f41a/{ n; p }' via Host: 10.0.32.210} {returns: []}
```
2025-10-14 15:08:57 +02:00
..