Check eval statements in DataCiteEvent.pm

[jesusbagpuss]

This needs a sanity check - I may have confused myself!

I think these two lines are redundant, and have been superceeded by the lines below.

DataCiteDoi/lib/plugins/EPrints/Plugin/Event/DataCiteEvent.pm

Lines 12 to 13 in fb9379f

	eval "use LWP; use HTTP::Headers::Util";
	eval "use WWW::Curl::Easy";

These following two sets of evals appear to be incorrect, and will not print the error message if the module isn't available?

DataCiteDoi/lib/plugins/EPrints/Plugin/Event/DataCiteEvent.pm

Line 28 in fb9379f

if ( eval "use WWW::Curl::Easy" ) { print STDERR "Unable to import WWW::Curl::Easy.\n"; }

DataCiteDoi/lib/plugins/EPrints/Plugin/Event/DataCiteEvent.pm

Lines 33 to 34 in fb9379f

	if ( eval "use LWP" ) { print STDERR "Unable to import LWP.\n"; }
	if ( eval "use HTTP::Headers::Util" ) { print STDERR "Unable to import HTTP::Headers::Util.\n"; }

If I replicate the above with a non-existent module:
perl -e 'if ( eval "use Wibble::Dodah" ) { print STDERR "Unable to import Wibble::Dodah.\n"; }'
it doesn't print the error message.

There may be some trickery going on here - but I think I would expect the eval return to be undef if the module isn't available..?