replaced return; with return undef;

lib/WebGUI/Operation/AdSpace.pm

@@ -54,7 +54,7 @@ Handles a click on an advertisement.
 sub www_clickAd {
 	my $session = shift;
 	my $id = $session->form->param("id");
-	return unless $id;
+	return undef unless $id;
 	my $url = WebGUI::AdSpace->countClick($session, $id);
 	$session->http->setRedirect($url);
 	return "Redirecting to $url";

lib/WebGUI/Operation/Help.pm

@@ -91,7 +91,7 @@ and set the __PROCESSED flag to prevent processing entries twice.
 
 sub _process {
 	my ($session, $helpEntry, $key) = @_;
-	return if exists($helpEntry->{__PROCESSED}) and $helpEntry->{__PROCESSED};
+	return undef if exists($helpEntry->{__PROCESSED}) and $helpEntry->{__PROCESSED};
 	$helpEntry->{related} = [ _related($session, $helpEntry->{related}) ];
 	##Add an ISA link unless it already exists.
 	##This simplifies handling later.
@@ -157,7 +157,7 @@ sub _get {
 	}
 	else {
 		$session->errorHandler->warn("Unable to load help for $namespace -> $id");
-		return;
+		return undef;
 	}
 }
 

lib/WebGUI/Operation/SSO.pm

@@ -45,7 +45,7 @@ sub www_ssoViaSessionId {
 			}
 		}
 	}
-	return;
+	return undef;
 }
 
 

lib/WebGUI/Operation/SpellCheck.pm

@@ -41,12 +41,12 @@ An instanciated session object.
 sub _getSpeller {
 	my ($baseDir, $userDir, $homeDir);
 	my $session = shift;
-	return unless Text::Aspell->can('new');
+	return undef unless Text::Aspell->can('new');
 	my $speller = Text::Aspell->new;
 
 	# Get language
 	my $lang = $session->form->process('lang');
-	return unless (isIn($lang, map {m/^.*?:([^:]*):.*?$/} $speller->list_dictionaries));
+	return undef unless (isIn($lang, map {m/^.*?:([^:]*):.*?$/} $speller->list_dictionaries));
 
 	# User homedir
 	my $userId = $session->user->userId;

lib/WebGUI/Operation/User.pm

@@ -295,7 +295,7 @@ Allows an administrator to assume another user.
 sub www_becomeUser {
 	my $session = shift;
 	return $session->privilege->adminOnly() unless canEdit($session);
-	return unless WebGUI::User->validUserId($session, $session->form->process("uid"));
+	return undef unless WebGUI::User->validUserId($session, $session->form->process("uid"));
 	$session->var->end($session->var->get("sessionId"));
 	$session->user({userId=>$session->form->process("uid")});
 	return "";

lib/WebGUI/Operation/VersionTag.pm

@@ -537,7 +537,7 @@ sub www_setWorkingVersionTag {
 		$tag->setWorking();
 	}
 	if ($session->form->param("backToSite")) {
-		return;
+		return undef;
 	}
 	return www_manageVersions($session);
 }