Merge pull request #13 from Rikstone/master

Update condition for empty hostnames

Author: DavidGoodwin

src/Nmap/XmlOutputParser.php

@@ -194,7 +194,7 @@ public function parse(): array
 
             $hostnameElement = $xmlHost->hostnames?->hostname ?? null;
 
-            if (!$hostnameElement instanceof SimpleXMLElement) {
+            if (!$hostnameElement instanceof SimpleXMLElement && $hostnameElement !== null) {
                 continue; // ? log ? throw?
             }