Fix bug launching plate viewer without ultrack (#24)

* Refactor __init__ to skip `open_image_and_tracks` if ultrack is not installed

* Revert "Refactor __init__ to skip `open_image_and_tracks` if ultrack is not installed"

This reverts commit 6955b76.

* Move ultrack import into `open_image_and_tracks`

* add py312 to tox

src/napari_iohub/_view_tracks.py

@@ -6,7 +6,6 @@
 
 from iohub.ngff import open_ome_zarr
 from magicgui import magic_factory
-from ultrack.reader.napari_reader import read_csv
 from xarray import open_zarr
 
 from napari_iohub._reader import fov_to_layers
@@ -84,6 +83,11 @@ def open_image_and_tracks(
         List of layers to add to the viewer.
         (image layers and one labels layer)
     """
+    try:
+        from ultrack.reader.napari_reader import read_csv
+    except ImportError:
+        raise ImportError("Please install napari-iohub[clustering]")
+
     _logger.info(f"Loading images from {images_dataset}")
     image_plate = open_ome_zarr(images_dataset)
     image_fov = image_plate[fov_name]

tox.ini

@@ -1,12 +1,13 @@
 # For more information about tox, see https://tox.readthedocs.io/en/latest/
 [tox]
-envlist = py{310,311}-{linux,macos,windows}
+envlist = py{310,311,312}-{linux,macos,windows}
 isolated_build=true
 
 [gh-actions]
 python =
     3.10: py310
     3.11: py311
+    3.12: py312
 
 [gh-actions:env]
 PLATFORM =