[yt-dev] Issue #1213: annotate_magnetic_field fails with off-axis slice plot (yt_analysis/yt)

[Suoqing Ji]

New issue 1213: annotate_magnetic_field fails with off-axis slice plot
https://bitbucket.org/yt_analysis/yt/issues/1213/annotate_magnetic_field-fails-with-off

Suoqing Ji:

Test script:
```
#!python

import yt
import numpy as np

nn = 100

data = dict(magnetic_field_x = np.random.random((nn,nn,nn)),
            magnetic_field_y = np.random.random((nn,nn,nn)),
            magnetic_field_z = np.random.random((nn,nn,nn)))

bbox = np.array([[-1, 1], [-1, 1], [-1, 1]])
ds = yt.load_uniform_grid(data, (nn,nn,nn), length_unit="cm", bbox=bbox, nprocs=1)
L = [1, 1, 0]
north_vector = [0, 0, 1]
slc = yt.SlicePlot(ds, L, 'magnetic_field_x', width=(1 ,'cm'), north_vector=north_vector)
slc.annotate_magnetic_field(factor=40, normalize=True)
slc.save()
```

Error:
```
#!python
Traceback (most recent call last):
  File "yt_magnetic_fields.py", line 16, in <module>
    slc.save()
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/visualization/plot_container.py", line 78, in newfunc
    args[0]._setup_plots()
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/visualization/plot_window.py", line 936, in _setup_plots
    self.run_callbacks()
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/visualization/plot_window.py", line 989, in run_callbacks
    sys.exc_info()[2])
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/visualization/plot_window.py", line 985, in run_callbacks
    callback(cbw)
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/visualization/plot_modifications.py", line 316, in __call__
    return qcb(plot)
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/visualization/plot_modifications.py", line 838, in __call__
    plot.data[self.field_x],
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 263, in __getitem__
    f = self._determine_fields([key])[0]
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 987, in _determine_fields
    finfo = self.ds._get_field_info("unknown", fname)
  File "/Users/jisuoqing/Workspace/code/yt-x86_64/src/yt-hg/yt/data_objects/static_output.py", line 626, in _get_field_info
    raise YTFieldNotFound((ftype, fname), self)
yt.utilities.exceptions.YTPlotCallbackError: annotate_magnetic_field callback failed with the following error: Could not find field '('io', 'cutting_plane_bx')' in UniformGridData.
```


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