Fixed a bug where WG::Sess:Form->param would return duplicate params

docs/changelog/7.x.x.txt

@@ -20,6 +20,8 @@
         http://www.plainblack.com/bugs/tracker/clear-login-history-period-is-calculated-24-times-longer-if-it-is-set-in-months#VomZpVCroSN6WoQ-UYo7Xw
  - fix: SQLForm - cannot add new asset (revisited) (thanks to Joek Hondius)
         http://www.plainblack.com/bugs/tracker/sqlform---cannot-add-new-asset-revisited#barqLwFe3LPODb4Mksc6ZA
+ - fix: Fixed a bug where $session->form->param() would return params twice. 
+ 	(Martin Kamerbeek / Oqapi)
 
 7.3.13
  - fix: Stale pages after user login

lib/WebGUI/Session/Form.pm

@@ -143,14 +143,14 @@ sub param {
 		}
 	} else {
 		if ($self->session->request) {
-			my @params = ();
+			my %params = ();
 			foreach ($self->session->request->param) {
-				push(@params, $_);
+				$params{$_} = 1;
 			}
 			foreach ($self->session->request->body) {
-				push(@params, $_);
+				$params{$_} = 1; 
 			}
-			return @params;
+			return keys %params;
 		} else {
 			return undef;
 		}