enable push to send empty files

clusterd

@@ -384,6 +384,11 @@ sub push_file {
 	$st->type eq 'F' or die "$filename: not a plain file\n";
 	$st->size<=65536 or die "$filename: to big for broadcast (max 65536 bytes)\n";
 
+	if ($st->size==0) {
+		udp_broadcast_message($donald_s,'filedata',$st,0,'');
+		return;
+	}
+
 	my $fh=new IO::File $filename,'<' or return warn "$filename: $!\n";
 	my $i=0;
 	for (my $pos=0;$pos<$st->size;$pos+=1024) {