Proper warning if xml.etree.ElementTree is not available

diff --git a/youtube-dl b/youtube-dl
index 733e231..ae4917b 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -66,8 +66,8 @@ except ImportError:
 
 try:
        import xml.etree.ElementTree
-except ImportError: # Python<2.5
-       pass # Not officially supported, but let it slip
+except ImportError: # Python<2.5: Not officially supported, but let it slip
+       warnings.warn('xml.etree.ElementTree support is missing. Consider upgrading to Python >= 2.5 if you get related errors.')
 
 std_headers = {
        'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1',