If the FlickID parameter in the Author section in the config is not set or if it
is set to the empty string, the section is not inserted in the footer.
At least in Hugo 0.18 (I don't know for prior versions), the variables in the
templates are all set to lowercase even if they are not lowercase in the
config file.
For instance, for a configuration as follows:
[Author]
Handle = "bla"
the variable must be used as .Site.Author.handle and not .Site.Author.Handle.
