Exception while downloading books

[sidney]

I think I saw something similar when downloading the opds itself, but I wasn't paying attention then. Download continues ok in spite of these exceptions. Maybe it happens when an entry does not have a timestamp, if that is possible?

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calibre, version 2.71.0
ERROR: Unhandled exception: TypeError:'NoneType' object is not iterable

calibre 2.71 embedded-python: True is64bit: True
Linux-4.1.13-100.fc21.x86_64-x86_64-with-fedora-21-Twenty_One Linux ('64bit', 'ELF')
('Linux', '4.1.13-100.fc21.x86_64', '#1 SMP Tue Nov 10 13:13:20 UTC 2015')
Python 2.7.9
Linux: ('Fedora', '21', 'Twenty One')
Successfully initialized third party plugins: OPDS Client (1, 0, 0)
Traceback (most recent call last):
File "site-packages/calibre/gui2/library/models.py", line 923, in data
TypeError: 'NoneType' object is not iterable