Allow empty-ish lastmodified and clean up FeedFetcher Test (#458)

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/Fetcher/FeedFetcher.php b/lib/Fetcher/FeedFetcher.php
index fe6910e5b..bcf6081e3 100755
--- a/lib/Fetcher/FeedFetcher.php
+++ b/lib/Fetcher/FeedFetcher.php
@@ -73,7 +73,7 @@ class FeedFetcher implements IFeedFetcher
         }
         $url = $url2->getNormalizedURL();
         $this->reader->resetFilters();
-        if (is_null($lastModified) || !is_string($lastModified)) {
+        if (empty($lastModified) || !is_string($lastModified)) {
             $resource = $this->reader->read($url);
         } else {
             $resource = $this->reader->readSince($url, new DateTime($lastModified));