don't try to deliver empty hashes

Zotlabs/Daemon/Deliver.php

@@ -17,6 +17,9 @@ class Deliver {
 
 		for($x = 1; $x < $argc; $x ++) {
 
+			if(! $argv[$x])
+				continue;
+
 			$dresult = null;
 			$r = q("select * from outq where outq_hash = '%s' limit 1",
 				dbesc($argv[$x])

include/network.php

@@ -1916,6 +1916,9 @@ function do_delivery($deliveries) {
 	$deliver = array();
 	foreach($deliveries as $d) {
 
+		if(! $d)
+			continue;
+
 		$deliver[] = $d;
 
 		if(count($deliver) >= $deliveries_per_process) {