Remove EE default generator tag.

[iammattmartin]

Is your feature request related to a problem? Please describe.
Yes, when there are no entries on a RSS feed, an automatic generator is inserted with shows EE and the exact version number.

This could be a data disclosure risk for some who have configured a template, forgotten about it and then have not upgraded allowing a malicious actor to exploit any unpatched issues.

Describe the solution you'd like
Removing the generator tag entirely or maybe just using "Expression Engine" instead of the version. I doubt there is much of a technical reason why the version is needed in this specific place.

Describe alternatives you've considered
Using the empty_feed option does work around but isn't one many would use I don't think for that specific outcome.

[intoeetive]

@iammattmartin this sounds completely legit!
Would you be willing to submit a pull request with the generator line being removed to RSS module file?

[iammattmartin]

Sure.

#1189