Mark email field as undefined in _config.yml

Author: sh-dima

_config.yml

@@ -27,7 +27,7 @@ author:
   pronouns         : # example: "she/her"  
   bio              : ""
   location         : "Linz, Austria"
-  email            : "" 
+  email            :
 
   arxiv            : # URL - Update with the correct link to your profile
   googlescholar    :