make_neuron_neuroglancer_link fails with show_inputs/show_outputs=True

[bdpedigo]

MRE

import caveclient as cc
from nglui.statebuilder import make_neuron_neuroglancer_link

client = cc.CAVEclient("minnie65_phase3_v1")

# works
make_neuron_neuroglancer_link(client, 864691135941359220)

# breaks
make_neuron_neuroglancer_link(client, 864691135941359220, show_inputs=True)

# also breaks 
make_neuron_neuroglancer_link(client, 864691135941359220, show_outputs=True)

Output

Traceback (most recent call last):
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/sandbox/nglui_mre.py", line 10, in <module>
    make_neuron_neuroglancer_link(client, 864691135941359220, show_inputs=True)
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/helpers.py", line 630, in make_neuron_neuroglancer_link
    return package_state(dataframes, sb, client, shorten, return_as, ngl_url, link_text)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/helpers.py", line 374, in package_state
    url = make_url_robust(df, sb, client, shorten=shorten, ngl_url=ngl_url)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/helpers.py", line 329, in make_url_robust
    url = make_state_url(df, sb, client)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/helpers.py", line 288, in make_state_url
    state = sb.render_state(df, return_as="dict")
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/statebuilder.py", line 269, in render_state
    return last_builder.render_state(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/statebuilder.py", line 158, in render_state
    self.handle_positions(data)
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/statebuilder.py", line 112, in handle_positions
    pos = l._set_view_options(self._temp_viewer, data, viewer_resolution=self._resolution)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/layers.py", line 461, in _set_view_options
    pos = rule._get_position(
          ^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/mappers.py", line 398, in _get_position
    data = self._preprocess_data(data, skip_columns=self.data_columns[1:], first=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/mappers.py", line 345, in _preprocess_data
    data = self._process_columns(data, skip_columns=skip_columns)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/nglui/statebuilder/mappers.py", line 330, in _process_columns
    data[col] = np.vstack(data[split_cols].values).tolist()
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ben.pedigo/code/skedits/skedits-app/skedits/.venv/lib/python3.11/site-packages/numpy/core/shape_base.py", line 289, in vstack
    return _nx.concatenate(arrs, 0, dtype=dtype, casting=casting)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: need at least one array to concatenate

[bdpedigo]

Update: this works when also passing a timestamp for which this root was valid, so that was my issue.

I still think the interface should behave more intuitively or at least guard against this - thoughts on inferring the latest timestamp that a root is valid, if none is provided? Or adding a check for whether the root is valid for the given timestamp, including None (now)?