[yt-dev] Issue #1226: [win/py35] Failure in test_alt_ray_tracers.py (yt_analysis/yt)

[Kacper Kowalik]

New issue 1226: [win/py35] Failure in test_alt_ray_tracers.py
https://bitbucket.org/yt_analysis/yt/issues/1226/win-py35-failure-in-test_alt_ray_tracerspy

Kacper Kowalik:

Build link: https://ci.appveyor.com/project/Xarthisius/yt/build/1.0.4/job/v94w79kw8kl54jj7

```
======================================================================
ERROR: Failure: ValueError (Does not understand character buffer dtype format string ('?'))
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Miniconda-x64\envs\test\lib\site-packages\nose\failure.py", line 39, in runTest
    raise self.exc_val.with_traceback(self.tb)
  File "C:\Miniconda-x64\envs\test\lib\site-packages\nose\loader.py", line 252, in generate
    for test in g():
  File "c:\projects\yt\yt\utilities\lib\tests\test_alt_ray_tracers.py", line 65, in test_cylindrical_ray_trace
    t, s, rztheta, inds = cylindrical_ray_trace(p1, p2, left_grid, right_grid)
  File "yt\utilities\lib\alt_ray_tracers.pyx", line 203, in yt.utilities.lib.alt_ray_tracers.cylindrical_ray_trace (yt/utilities/lib\alt_ray_tracers.c:5983)
ValueError: Does not understand character buffer dtype format string ('?')
 
----------------------------------------------------------------------
Ran 7654 tests in 2398.595s
 
FAILED (errors=1)
Command exited with code 1
```