monitortest: fix empty value for machine phase

[mkowalski]

I have discovered that at times it happens that I see Machine is in "" in the reported intervals. This is not correct and may be caused by the fact that phase is defined as an optional Phase *string json:"phase,omitempty" field so technically an empty value is correct one there.

In any case, for constructing interval I would prefer to explicitly see "missing" message instead of empty value.

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[mkowalski]

/test e2e-metal-ipi-ovn-ipv6

[mkowalski]

/hold

[mkowalski]

/test e2e-metal-ipi-ovn-ipv6

[openshift-ci]

@mkowalski: all tests passed!

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