Re-Add the ability to set a empty string as option parameter

[roidelapluie]

Prior to 136b1aa it was possible to
have an empty string as value of a my.cnf parameter, resulting in a line
with just the parameter name.

That commit re-enable that behavior that was removed by accident.

[igalic]

duh… i think it was discussed separately, but never really fixed :(
thank you very much for catching and fixing this, @roidelapluie!

[baurmatt]

This change just broke a couple of our MySQL installations. We definitely need a feature to remove values we do not need from the $default_options hash. Setting the option to 'undef' doesn't work for us as we're using Hiera.

[hunner]

@baurmatt What about using ~ as the value in hiera, assuming you're using yaml? Or whatever the nil/null value is for the backend you're using. re https://groups.google.com/forum/#!topic/puppet-users/0l3m4VCHjOg

[baurmatt]

@hunner Woah, honestly i thought no one would care about a comment in an old issue, but you did and suggested a solution which doesn't need any modification at all. Thank you very much, works great! :)

[hunner]

I get emailed for comments and usually keep an eye out for PRs that broke something unexpected. Thanks for reporting it!

[roidelapluie]

Thanks guys. Sorry it broke your setup, be aware that it broke mine first :) Nice @hunner the ~ tip.