Setting `security.nocertdb` to `true` breaks pageinfo dialog and certificate viewer

TorBrowser 3.6.6 for OS X will not display technical details of TLS connections. To reproduce, click on the padlock in the URL field of an HTTPS site. Choose "More information" and click on the "Security" tab. The "Technical Details" field, which would normally display the cipher suite in use, is blank.

(see: https://blog.torproject.org/blog/tor-browser-366-released#comment-75736 for the original bug report)

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