unit-test and fix for deleted routers

[meejah]

See #255

[coveralls]

Coverage decreased (-0.2%) to 99.786% when pulling ca3be512a19f710a5eb5485d02e9f7d6aea0ddc3 on issue255-del-routers into 46c0c393d7135601d12ff564afd3a8a76652977d on master.

[codecov-io]

Codecov Report

Merging #256 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
+ Coverage   99.94%   99.94%   +<.01%     
==========================================
  Files          20       20              
  Lines        3710     3713       +3     
==========================================
+ Hits         3708     3711       +3     
  Misses          2        2

Impacted Files	Coverage Δ
txtorcon/util.py	99.1% <100%> (ø)	:arrow_up:
txtorcon/torstate.py	100% <100%> (ø)	:arrow_up:
txtorcon/torcontrolprotocol.py	100% <100%> (ø)	:arrow_up:

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[coveralls]

Coverage decreased (-0.2%) to 99.705% when pulling 5ba4db692b16dc086f80d393126cd46bb8013832 on issue255-del-routers into 46c0c393d7135601d12ff564afd3a8a76652977d on master.

[coveralls]

Coverage decreased (-0.2%) to 99.705% when pulling 337554644882b823b9ce2e04dcd9dc827e0ce34e on issue255-del-routers into 46c0c393d7135601d12ff564afd3a8a76652977d on master.

[coveralls]

Coverage increased (+4.0e-05%) to 99.946% when pulling b4ae30f3dab418c4926e2ac2a0ecfdaeb125193a on issue255-del-routers into a0f17844be2305347c7df9f601990db5ebe178ae on master.

[coveralls]

Coverage increased (+4.0e-05%) to 99.946% when pulling b4ae30f3dab418c4926e2ac2a0ecfdaeb125193a on issue255-del-routers into a0f17844be2305347c7df9f601990db5ebe178ae on master.

[coveralls]

Coverage increased (+4.0e-05%) to 99.946% when pulling b4ae30f3dab418c4926e2ac2a0ecfdaeb125193a on issue255-del-routers into a0f17844be2305347c7df9f601990db5ebe178ae on master.

[coveralls]

Coverage increased (+4.0e-05%) to 99.946% when pulling 838285ecd228a3da69756fddfcb96ed2e12e73ba on issue255-del-routers into a0f17844be2305347c7df9f601990db5ebe178ae on master.

[coveralls]

Coverage increased (+4.0e-05%) to 99.946% when pulling 838285ecd228a3da69756fddfcb96ed2e12e73ba on issue255-del-routers into a0f17844be2305347c7df9f601990db5ebe178ae on master.

[coveralls]

Coverage increased (+4.0e-05%) to 99.946% when pulling 838285ecd228a3da69756fddfcb96ed2e12e73ba on issue255-del-routers into a0f17844be2305347c7df9f601990db5ebe178ae on master.