Several content elements (the xml files at administrator/components/com_joomfish/contentelements) had been deleted during upgrade and some of them got obligate. But at the back end of Joomla, the OrphanOverview showed nothing but notices/errors/warnings in the apache2 error.log file.
To get rid of this behavior, I changed these lines making the code more robust too.
It's essential to build a template with empty rows too.
Merge pull request #10 from tkuschel/patch-1

Merging pull request from TKuschel related more robust check of content element files as well as two line template presentation.