Wikimedia Bugzilla is closed!

In this py3 build, there are some network issues, and py3 exception handling shows three exceptions, including json decoding exceptions.  The result is confusing to someone unfamiliar with py3 or not intimately aware of how the api.py request error handling is organised.

https://travis-ci.org/wikimedia/pywikibot-core/jobs/39178815

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ERROR: testLinkMethods (tests.site_tests.TestSiteObject)
Test site methods for getting links to and from a page.
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Traceback (most recent call last):
  File "/opt/python/3.3.5/lib/python3.3/json/decoder.py", line 367, in raw_decode
    obj, end = self.scan_once(s, idx)
StopIteration
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/travis/build/wikimedia/pywikibot-core/pywikibot/data/api.py", line 606, in submit
    result = json.loads(rawdata)
  File "/opt/python/3.3.5/lib/python3.3/json/__init__.py", line 316, in loads
    return _default_decoder.decode(s)
  File "/opt/python/3.3.5/lib/python3.3/json/decoder.py", line 351, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/opt/python/3.3.5/lib/python3.3/json/decoder.py", line 369, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/travis/build/wikimedia/pywikibot-core/tests/site_tests.py", line 331, in testLinkMethods
    filterRedirects=False))
  File "/home/travis/build/wikimedia/pywikibot-core/pywikibot/site.py", line 2582, in pagebacklinks
    content=content
  File "/home/travis/build/wikimedia/pywikibot-core/pywikibot/site.py", line 2568, in pagebacklinks
    for redir in redirgen:
  File "/home/travis/build/wikimedia/pywikibot-core/pywikibot/data/api.py", line 1095, in __iter__
    self.data = self.request.submit()
  File "/home/travis/build/wikimedia/pywikibot-core/pywikibot/data/api.py", line 828, in submit
    self._data = super(CachedRequest, self).submit()
  File "/home/travis/build/wikimedia/pywikibot-core/pywikibot/data/api.py", line 624, in submit
    self.wait()
  File "/home/travis/build/wikimedia/pywikibot-core/pywikibot/data/api.py", line 711, in wait
    raise TimeoutError("Maximum retries attempted without success.")
pywikibot.data.api.TimeoutError: Maximum retries attempted without success.