Address the optional nature of knative on the Add Page

[andrewballantyne]

Got a NPE on the Add Page when Knative isn't installed.

https://jira.coreos.com/browse/ODC-2340

It's an optional resource, so it shouldn't be expected to be part of the resources array.

    {
      isList: true,
      kind: referenceForModel(ServiceModel),
      namespace,
      prop: 'knativeService',
      optional: true,
      limit: 1,
    },

/cc @debsmita1

[andrewballantyne]

/retest

[christianvogt]

/lgtm
/approve

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