title: Allen Brain Observatory - get_stimulus_template doesn't work with static_gratings
body: <p>I am analyzing data from an experiment with the static_gratings stimulus. The SDK documentation says the get_stimulus_template function can take as an argument any stimulus used in a queried experiment. I called list_stimuli() on the experiment to confirm static_gratings is a used stimulus. </p>
  
  <p>When I run get_stimulus_template('static_gratings'), I get this traceback/error:</p>
  
  <pre><code>  Traceback (most recent call last):
  
    File "&lt;ipython-input-46-be84d6ea7546&gt;", line 1, in &lt;module&gt;
      sg_scenes = expData.get_stimulus_template('static_gratings')
  
    File "/Users/randallellis/anaconda/lib/python2.7/site-packages/allensdk/core/brain_observatory_nwb_data_set.py", line 373, in get_stimulus_template
      image_stack = f['stimulus']['templates'][stim_name]['data'].value
  
    File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper (/Users/ilan/minonda/conda-bld/h5py_1490025880382/work/h5py/_objects.c:2846)
  
    File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper (/Users/ilan/minonda/conda-bld/h5py_1490025880382/work/h5py/_objects.c:2804)
  
    File "/Users/randallellis/anaconda/lib/python2.7/site-packages/h5py/_hl/group.py", line 169, in __getitem__
      oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
  
    File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper (/Users/ilan/minonda/conda-bld/h5py_1490025880382/work/h5py/_objects.c:2846)
  
    File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper (/Users/ilan/minonda/conda-bld/h5py_1490025880382/work/h5py/_objects.c:2804)
  
    File "h5py/h5o.pyx", line 190, in h5py.h5o.open (/Users/ilan/minonda/conda-bld/h5py_1490025880382/work/h5py/h5o.c:3740)
  
  KeyError: "Unable to open object (Object 'static_gratings_image_stack' doesn't exist)"
  </code></pre>
  
  <p>Any help with this is appreciated.</p>