Symphony: defer work to after filtering

module/VuFind/src/VuFind/ILS/Driver/Symphony.php

@@ -490,20 +490,20 @@ class Symphony extends AbstractBase implements ServiceLocatorAwareInterface
 
         foreach ($callInfos as $callInfo) {
             $libraryID = $callInfo->libraryID;
-            $library = $this->translatePolicyID('LIBR', $libraryID);
 
             if ($this->libraryIsFilteredOut($libraryID)) {
                 continue;
             }
 
-            $copyNumber = 0; // ItemInfo does not include copy numbers,
-                             // so we generate them under the assumption
-                             // that items are being listed in order.
-
             if (!isset($callInfo->ItemInfo)) {
                 continue; // no items!
             }
 
+            $library = $this->translatePolicyID('LIBR', $libraryID);
+            $copyNumber = 0; // ItemInfo does not include copy numbers,
+                             // so we generate them under the assumption
+                             // that items are being listed in order.
+
             $itemInfos = is_array($callInfo->ItemInfo)
                 ? $callInfo->ItemInfo
                 : array($callInfo->ItemInfo);