Bubble up buildOperations error.

[godwinpang]

Errors encountered in buildOperations should not fail silently.
I ran into an issue where BuildOpenAPISpecFromRoutes (

kube-openapi/pkg/builder/openapi.go

Line 52 in b456828

func BuildOpenAPISpecFromRoutes(routeContainers []common.RouteContainer, config *common.Config) (*spec.Swagger, error) {

) would return indeterministic results due to buildOperations errors not being bubbled up.

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[Jefftree]

Thanks!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: austince, godwinpang, Jefftree

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[godwinpang]

@Jefftree fixed the gofmt issue, could I get a followup lgtm?

[Jefftree]

/lgtm