Model inclusion of track graph in Decoding notebooks

[CBroz1]

This line mentions the possibility of including a track graph in decoding

https://github.com/LorenFrankLab/spyglass/blob/03e39960e31bb358ba3f112220a5fdbb2e6acc76/notebooks/py_scripts/41_Decoding_Clusterless.py#L259-L261

In my brief attempt, I did not find the process of including this graph straight forward, needing to remap kwargs across a fetched value and classes from non_local_detector. I hit errors with the embedded ObservationModel having an empty name

Partial error stack

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
src/spyglass/utils/dj_mixin.py:612: in populate
    return super().populate(*restrictions, **kwargs)
../datajoint-python/datajoint/autopopulate.py:254: in populate
    status = self._populate1(key, jobs, **populate_kwargs)
../datajoint-python/datajoint/autopopulate.py:322: in _populate1
    make(dict(key), **(make_kwargs or {}))
src/spyglass/decoding/v1/clusterless.py:212: in make
    classifier.fit(
../../miniconda3/envs/spy/lib/python3.9/site-packages/non_local_detector/models/base.py:960: in fit
    self._fit(
../../miniconda3/envs/spy/lib/python3.9/site-packages/non_local_detector/models/base.py:493: in _fit
    self.initialize_state_index()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = ClusterlessDetector(clusterless_algorithm='clusterless_kde',
                    clusterless_algorithm_params={'block_...ke=False)],
                    sampling_frequency=500.0,
                    state_names=['Continuous', 'Fragmented'])

    def initialize_state_index(self):
        self.n_discrete_states_ = len(self.state_names)
        bin_sizes = []
        state_ind = []
        is_track_interior = []
        for ind, obs in enumerate(self.observation_models):
            if obs.is_local or obs.is_no_spike:
                bin_sizes.append(1)
                state_ind.append(ind * np.ones((1,), dtype=int))
                is_track_interior.append(np.ones((1,), dtype=bool))
            else:
                environment = self.environments[
>                   self.environments.index(obs.environment_name)
                ]
E               ValueError: '' is not in list

../../miniconda3/envs/spy/lib/python3.9/site-packages/