[MODULES-3882] Don't write empty servername for vhost to template #1526
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If an empty servername is given to a vhost, it shouldn't be written
to the configuration file. Else we'll end up with an invalid
configuration and httpd will fail to start. It is actually valid not
to have a Servername, and in this case, httpd will route only based
on the IP.
This resolves bug https://tickets.puppetlabs.com/browse/MODULES-3882