support "accumulation" of a scalar by using an empty signature

modules/Bio/EnsEMBL/Hive/Utils/URL.pm

@@ -40,7 +40,7 @@ sub parse {
     my $url = shift @_ or return;
 
     if( my ($dbconn_part, $driver, $user, $pass, $host, $port, $dbname, $table_name, $tparam_name, $tparam_value, $conn_param_string) =
-        $url =~ m{^((\w*)://(?:(\w+)(?:\:([^/\@]*))?\@)?(?:([\w\-\.]+)(?:\:(\d*))?)?/([\w\-]*))(?:/(\w+)(?:\?(\w+)=([\w\[\]\{\}]+))?)?((?:;(\w+)=(\w+))*)$} ) {
+        $url =~ m{^((\w*)://(?:(\w+)(?:\:([^/\@]*))?\@)?(?:([\w\-\.]+)(?:\:(\d*))?)?/([\w\-]*))(?:/(\w+)(?:\?(\w+)=([\w\[\]\{\}]*))?)?((?:;(\w+)=(\w+))*)$} ) {
 
         my %conn_params = split(/[;=]/, 'type=hive;discon=0'.$conn_param_string );