Reverse an earlier over-zealous check for a non-null value of the retriever. This prevented lots and lots of feed items coming through.

Conflicts:
	retriever/retriever.php

retriever/retriever.php

@@ -277,10 +277,8 @@ function retriever_item_completed($retriever_item_id, $resource) {
     if (!$retriever_item) {
         return;
     }
+    // Note: the retriever might be null.  Doesn't matter.
     $retriever = get_retriever($retriever_item['contact-id'], $retriever_item['item-uid']);
-    if (!$retriever) {
-        return;
-    }
     $item = retriever_get_item($retriever_item);
     if (!$item) {
         return;