`govc ls /testDC/host/dummyCluster` returns success code when path is absent

[mdshoaib707]

Describe the bug
When govc ls is run against a non-existent vSphere path like /testDC/host/dummyCluster, it yields an exit code of 0. This is incorrect; a non-zero exit code is expected for non-existent resources.
For example, when I use govc ls /testDC/host/dummyCluster , in any case the exit code is 0 even if the cluster doesn't exist. Considering cluster1 exists but any other name dummyCluster doesn't exist and we still get an exit code 0 which shouldn't be the case.

To Reproduce
Steps to reproduce the behavior:

1. govc ls /testDC/host/cluster1
2. echo $?
3. govc ls /testDC/host/dummyCluster
4. echo $?

Expected behavior
A clear and concise description of what you expected to happen.
govc ls /testDC/host/cluster1 should give proper exit code and non-zero if the cluster doesn't exist.

Affected version
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Screenshots/Debug Output
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Additional context
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