Better error message if search limit exceeded

[ygrek]

Original report by Dmitry Bolshakov (Bitbucket: bdimych, GitHub: bdimych).

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http://zimmermann.mayfirst.org:11371/pks/lookup?search=Bitcoin&op=vindex
"Error handling request. Exception raised."

http://zimmermann.mayfirst.org:11371/pks/lookup?search=Bitcoin+Core&op=vindex
results displayed

I asked
http://security.stackexchange.com/questions/135197/gpg-server-hides-search-results
and decided to write this bug - why not just print clear message "limit exceeded" ?

[wiml]

It looks like the problem is just the scope of the try ... with block in handle_get_request in dbserver.ml. There is code there to translate the exception into a clearer error message, but the exception is thrown a few lines before the try, and so it doesn't get caught.

[ygrek]

thanks