Added a simple smtpd for testing

MERGE: Added ability for WebGUI::Test->getPage to work on Operations
MERGE: Fix for AdSpace and tests for Operation::AdSpace
Fixed Poll's use of JSON
Added tests for emailOverride

lib/WebGUI/Asset/Wobject/Poll.pm

@@ -403,6 +403,7 @@ sub thawGraphConfig {
     my $self        = shift;
     my $string      = shift;
     
+    return unless $string;
     return JSON::from_json($string);
 }