Cannot load multiple volumes if one is missing channels (TZYX and TCZYX)

[ShrimpCryptid]

Description

Discovered when trying to load a dataset provided by Max.

In the dataset, there segmentations under nuclei.zarr in TZYX order and image data under data.zarr, in TCZYX order.

Each can be loaded separately without issues, but when the URLs are combined, vole-core attempts to access non-existent paths:

http://localhost:6470/data.zarr/1/0/NaN/1/0/0

Expected Behavior

Vol-E should be able to load the combined URLs.

Reproduction

A minimal example that exhibits the behavior.

Environment

Any additional information about your environment. E.g. OS version, python version, browser etc.

[ShrimpCryptid]

Update: Max says that this is an issue with the dataset, actually! The dataset should have matching axes for both segmentations/labels and data.

However, Vol-E doesn't emit an error message when this happens! Even if we decide we don't need to load data in this case, we should at least produce an error.

    └── labels
        │
        ├── .zgroup           # The labels group is a container which holds a list of labels to make the objects easily discoverable
        │
        ├── .zattrs           # All labels will be listed in .zattrs e.g. { "labels": [ "original/0" ] }
        │                     # Each dimension of the label (t, c, z, y, x) should be either the same as the
        │                     # corresponding dimension of the image, or 1 if that dimension of the label
        │                     # is irrelevant.
        │
        └── original          # Intermediate folders are permitted but not necessary and currently contain no extra metadata.
            │
            └── 0             # Multiscale, labeled image. The name is unimportant but is registered in the "labels" group above.
                ├── .zgroup   # Zarr Group which is both a multiscaled image as well as a labeled image.
                ├── .zattrs   # Metadata of the related image and as well as display information under the "image-label" key.
                │
                ├── 0         # Each multiscale level is stored as a separate Zarr array, as above, but only integer values
                │   ...       # are supported.
                └── n

[toloudis]

Summary of issue: if VolE is trying to combine channels of two zarrs, and one is a tczyx and the other is a tzyx, it's not smart enough to treat the tzyx as a single channel.

[ShrimpCryptid]

Dan: We should fix this.
Cameron: Okay, can assign to me. Moved to Ready