Arch Linux

I've just upgraded to the last version of calibre (2.52) and I've added an empty ebook, then I set the title as usual (it was "year without pants") and clicked on download metadata. It returned an error saying that there are no match found. I've tried with many other titles, but it cannot find any.

This is the error:

calibre, version 2.52.0
ERROR: No matches found: <p>Failed to find any books that match your search. Try making the search <b>less specific</b>. For example, use only the author's last name and a single distinctive word from the title.<p>To see the full log, click Show Details.

Running identify query with parameters:
{u'authors': None, u'identifiers': {}, u'timeout': 30, u'title': u'year without pants'}
Using plugins: Google, Amazon.com
The log from individual plugins is below

****************************** Google ******************************
Request extra headers: [('User-agent', 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)')]
Found 0 results
Downloading from Google took 0.445051908493

********************************************************************************

****************************** Amazon.com ******************************
Request extra headers: [('User-agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1')]
Found 0 results
Downloading from Amazon.com took 0.892254114151
Failed to parse amazon page for query: u'http://www.amazon.com/s/?sort=relevanceexprank&field-title=year+without+pants&search-alias=stripbooks&unfiltered=1'
Traceback (most recent call last):
File "/usr/lib/calibre/calibre/ebooks/metadata/sources/amazon.py", line 1063, in identify
namespaceHTMLElements=False)
File "/usr/lib/python2.7/site-packages/html5lib/html5parser.py", line 29, in parse
return p.parse(doc, encoding=encoding)
File "/usr/lib/python2.7/site-packages/html5lib/html5parser.py", line 236, in parse
parseMeta=parseMeta, useChardet=useChardet)
File "/usr/lib/python2.7/site-packages/html5lib/html5parser.py", line 94, in _parse
self.mainLoop()
File "/usr/lib/python2.7/site-packages/html5lib/html5parser.py", line 203, in mainLoop
new_token = phase.processComment(new_token)
File "/usr/lib/python2.7/site-packages/html5lib/html5parser.py", line 468, in processComment
self.tree.insertComment(token, self.tree.openElements[-1])
File "/usr/lib/python2.7/site-packages/html5lib/treebuilders/etree_lxml.py", line 312, in insertCommentMain
super(TreeBuilder, self).insertComment(data, parent)
File "/usr/lib/python2.7/site-packages/html5lib/treebuilders/_base.py", line 262, in insertComment
parent.appendChild(self.commentClass(token["data"]))
File "/usr/lib/python2.7/site-packages/html5lib/treebuilders/etree.py", line 148, in __init__
self._element = ElementTree.Comment(data)
File "src/lxml/lxml.etree.pyx", line 3017, in lxml.etree.Comment (src/lxml/lxml.etree.c:80806)
ValueError: Comment may not contain '--' or end with '-'

********************************************************************************
The identify phase took 1.07 seconds
The longest time (0.892254) was taken by: Amazon.com
Merging results from different sources and finding earliest publication dates from the worldcat.org service
We have 0 merged results, merging took: 0.00 seconds

Few versions ago it worked perfectly, but now it's been few weeks (or even months) that it returns this error, so it's not because of the v2.52

I've tried with the binary (http://calibre-ebook.com/download_linux) and it works, so it must be an arch bug