Raised TypeError in resultdump

Created by: juga0

Running sbws 09691a0f with python 3.5.3 in Tor network got the following:

[2018-06-23 14:08:33,325] [sbws.util.filelock] [DEBUG] Releasing lock  /path/.sbws_tor_35/datadir/.lockfile
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File " /path/simple-bw-scanner/sbws/lib/resultdump.py", line 478, in enter
    self.fresh_days, self.datadir)
  File " /path/simple-bw-scanner/sbws/lib/resultdump.py", line 106, in load_recent_results_in_datadir
    fname, success_only=success_only)
  File " /path/simple-bw-scanner/sbws/lib/resultdump.py", line 47, in load_result_file
    r = Result.from_dict(json.loads(line.strip()))
  File "/usr/lib/python3.5/json/__init__.py", line 319, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.5/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.5/json/decoder.py", line 355, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 502 (char 501)

Traceback (most recent call last):
  File " /path/.virtualenvs/simplebwscanner3/bin/sbws", line 11, in <module>
    load_entry_point('sbws', 'console_scripts', 'sbws')()
  File " /path/simple-bw-scanner/sbws/sbws.py", line 51, in main
    exit(comm['f'](*comm['a'], **comm['kw']))
  File " /path/simple-bw-scanner/sbws/core/scanner.py", line 402, in main
    run_speedtest(args, conf)
  File " /path/simple-bw-scanner/sbws/core/scanner.py", line 362, in run_speedtest
    for target in rp.best_priority():
  File " /path/simple-bw-scanner/sbws/lib/relayprioritizer.py", line 55, in best_priority
    results = rd.results_for_relay(relay)
  File " /path/simple-bw-scanner/sbws/lib/resultdump.py", line 503, in results_for_relay
    if fp not in self.data:
TypeError: argument of type 'NoneType' is not iterable

i've not investitgated what caused it, but it seems we should check that self.data is not None.

I think this has to be in milestone 1, even if it seems non-ending...