Multiple exception bug fixes identified during testing

app/Jobs/NodelistImport.php

@@ -295,9 +295,13 @@ class NodelistImport implements ShouldQueue
 
 			// We'll search and see if we already have that system
 			} else {
-				$so = System::where('mailer_address',$address)
-					->where('mailer_port',$port)
-					->single();
+				// If we dont have $address/port
+				$so = NULL;
+
+				if ($address && $port)
+					$so = System::where('mailer_address',$address)
+						->where('mailer_port',$port)
+						->single();
 
 				if (! $so)
 					$so = System::where('name',$system)