Closes #18.

CHANGES.rst

@@ -3,6 +3,8 @@ Release 0.8 (dev)
 
 - Add ``EMBED_VIDEO_TIMEOUT`` to settings.
 
+- Fix renderering template tag if no url is provided (`#18 <https://github.com/yetty/django-embed-video/issues/18>`_)
+
 
 Release 0.7 (Dec. 21, 2013)
 ---------------------------

embed_video/templatetags/embed_video_tags.py

@@ -67,6 +67,11 @@ class VideoNode(Node):
     def render(self, context):
         url = self.url.resolve(context)
 
+        # Fixes #18. If no video url is provided it should return an empty
+        # string instead raising UnknownBackendException.
+        if not url:
+            return ''
+
         if self.size:
             return self.__render_embed(url, context)
         else:

embed_video/tests/tests_tags.py

@@ -153,3 +153,11 @@ class EmbedVideoNodeTestCase(TestCase):
         backend = VideoNode.get_backend('http://www.youtube.com/watch?v=jsrRJyHBvzw', context)
         self.assertFalse(backend.is_secure)
 
+    def test_no_video_provided(self):
+        template = Template("""
+            {% load embed_video_tags %}
+            {% video '' 'large' %}
+        """)
+        self.assertEqual(template.render(self._grc()).strip(), '')
+
+