Update project_export.sh

[felixkrohn]

export endpoints only if the SVC has defined .spec.selector fields.
Prevents failure on SVC objects that only contain a spec.externalName field but no selectors.
Test case json:

{
  "apiVersion": "v1",
  "kind": "Service",
  "metadata": {
    "name": "test-svc"
  },
  "spec": {
    "externalName": "test-svc.domain.tld",
    "sessionAffinity": "None",
    "type": "ExternalName"
  }
}

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/lifecycle stale

[felixkrohn]

/remove-lifecycle stale

[felixkrohn]

/recheck