ResourceResolver#getResource("") & ResourceResolver(".") should return null

We noticed that ResourceResolver#getResource is returning unexpected values for "" (empty string) and ".") (dot).

We would expect null to be returned, however, instead we get an object whose toString is:
SyntheticResource, type=sling:syntheticResourceProviderResource, path=/apps

The sling.resolutionPath (in resource metadata) is set to /apps, which is also unexpected.