the input
Nulla at bibendum lacus. Donec ullamcorper arcu non nisi gravida.<!--more--> Mauris tristique tellus semper felis molestie, non luctus risus fermentum.
will produce an empty {{ .Summary }}, but
Nulla at bibendum lacus. Donec ullamcorper arcu non nisi gravida.
<!--more-->
Mauris tristique tellus semper felis molestie, non luctus risus fermentum.
will give “Nulla at bibendum lacus. Donec ullamcorper arcu non nisi gravida.” as a summary, but splits what should be one paragraph into two when the individual post is viewed.