Catch HTTPError in generateFallbackDirLine.py when descriptors are missing
$ $PYTHON generateFallbackDirLine.py 9695DFC35FFEB861329B9F1AB04C46397020CE31 BA44A889E64B93FAA2B114E02C2A279A8555C533 001524DD403D729F08F7E5D77813EF12756CFA8D 5AFAC3D00E97D6733112CC9CA2A788691FA87125 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
128.31.0.34:9131 orport=9101 id=9695DFC35FFEB861329B9F1AB04C46397020CE31 # moria1
66.111.2.131:9030 orport=9001 id=BA44A889E64B93FAA2B114E02C2A279A8555C533 ipv6=[2610:1c0:0:5::131]:9001 # Serge
Traceback (most recent call last):
File "generateFallbackDirLine.py", line 25, in <module>
desc = stem.descriptor.remote.get_server_descriptors(fingerprint).run()[0]
File "/usr/local/lib/python2.7/site-packages/stem/descriptor/remote.py", line 536, in run
return list(self._run(suppress))
File "/usr/local/lib/python2.7/site-packages/stem/descriptor/remote.py", line 547, in _run
raise self.error
stem.DownloadFailed: Failed to download from http://154.35.175.225:80/tor/server/fp/001524DD403D729F08F7E5D77813EF12756CFA8D (HTTPError): Servers unavailable
The command "$PYTHON generateFallbackDirLine.py 9695DFC35FFEB861329B9F1AB04C46397020CE31 BA44A889E64B93FAA2B114E02C2A279A8555C533 001524DD403D729F08F7E5D77813EF12756CFA8D 5AFAC3D00E97D6733112CC9CA2A788691FA87125 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" exited with 1.
https://travis-ci.org/torproject/fallback-scripts/jobs/637451068#L406