checkfeedaspromise: do not fail if feed contains no item

slapos/checkfeedaspromise.py

@@ -43,6 +43,9 @@ def checkFeedAsPromise(feed, option):
   if feed.bozo:
     return 'Feed malformed'
 
+  if len(feed.entries) == 0:
+    return ''
+
   last_item = feed.entries[-1]
   if option.title:
     candidate_string = last_item.title

slapos/test/test_checkfeedaspromise.py

@@ -118,5 +118,13 @@ class TestCheckFeedAsPromise(unittest.TestCase):
     self.assertNotEquals(len(checkFeedAsPromise(feed, option)), 0)
 
 
+  def test_noItemInTheFeedIsNotAnError(self):
+    option = self.getOptionObject()
+    option.title = True
+    
+    feed = self.generateFeed([])
+    self.assertEquals(checkFeedAsPromise(feed, option), "")
+
+
 if __name__ == '__main__':
   unittest.main()