DeutscheBahn.pm: Fix results initialization

lib/Travel/Status/DE/DeutscheBahn.pm

@@ -46,7 +46,6 @@ sub new {
 			start               => 'Suchen',
 			boardType           => $conf{mode} // 'dep',
 		},
-		results => [],
 	};
 
 	for my $i ( 0 .. @{ $ref->{mot_filter} } ) {
@@ -129,6 +128,8 @@ sub results {
 		return;
 	}
 
+	$self->{results} = [];
+
 	for my $tr ( @{ $self->{tree}->findnodes($xp_element) } ) {
 
 		my ($n_time) = $tr->findnodes($xp_time);