imported OpenVPN config. needs password for certs

I have an OpenVPN config generated from IPFire without password, but the import dialog needs a password to continue.

Workaround: chose "1" or anything as password

It should be possible to create a VPN Config. without password for the certs.

Launchpad Details: [#LP1642992](https://bugs.launchpad.net/bugs/1642992) davidak - 2016-11-18 16:06:22 +0000

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