remove empty condition list when doing v1 and v1alpha2 conversion.

[zetxqx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
While doing v1alpha2 and v1 infPool conversion, if the condition slice is empty we are always adding an empty placeholder slice. However, this is not consistent with the "omitempty"

	// +optional
	// +listType=map
	// +listMapKey=type
	// +kubebuilder:validation:MaxItems=8
	Conditions []metav1.Condition `json:"conditions,omitempty"`

Which issue(s) this PR fixes:

NONE

Does this PR introduce a user-facing change?:
NONE

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[capri-xiyue]

I think the conversion should map

1. nil to nil
2. [] to []

cc @zetxqx

also cc @danehans @robscott @kfswain Seems like we are going to cut the release

[zetxqx]

I think the conversion should map

1. nil to nil
2. [] to []

cc @zetxqx

also cc @danehans @robscott @kfswain Seems like we are going to cut the release

done

[zetxqx]

/assign @danehans

[danehans]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danehans, zetxqx

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