[Changed] Make lastStatusTime nullable, and add an example - #89

[P-027] info.description template 'additional-error-responses' has drifted from canonical at paragraph 3. canonical: Please refer to the `CAMARA_common.yaml` of the Commonalities Release associated to this API version for a complete list of error responses. The applicable C... found: Please refer to the `CAMARA_common.yaml` of the Commonalities Release associated to this API version for a complete list of error responses. The applicable C... Re-copy the BEGIN..END block from 'code/common/info-description-templates.yaml'. | Suggestion: Re-copy the BEGIN..END block from code/common/info-description-templates.yaml to replace the drifted content; the message identifies the first differing paragraph.