Fix inspector issue where color table missing.

nion/swift/Inspector.py

@@ -1229,7 +1229,8 @@ def __init__(self, document_controller: DocumentController.DocumentController, d
             self.color_map_items.append(color_map.name)
             self._color_map_flags.append(color_map_key)
         self._color_map_reverse_map = {p: i for i, p in enumerate(self._color_map_flags)}
-        self.current_colormap_index = Model.PropertyModel[int](self._color_map_reverse_map[self._display_data_channel.color_map_id])
+        color_map_index = self._color_map_reverse_map.get(self._display_data_channel.color_map_id, 0)
+        self.current_colormap_index = Model.PropertyModel[int](color_map_index)
 
         self.brightness_model = DisplayDataChannelPropertyCommandModel(document_controller, display_data_channel, "brightness", title=_("Change Brightness"), command_id="change_brightness")
 

nion/swift/test/Inspector_test.py

@@ -613,6 +613,17 @@ def test_image_display_inspector_sets_display_limits_when_text_is_changed(self):
             inspector_section.image_data_inspector_handler.display_limits_limit_high.editing_finished("")
             self.assertEqual(display_data_channel.display_limits, None)
 
+    def test_image_data_inspector_handles_missing_color_table(self) -> None:
+        with TestContext.create_memory_context() as test_context:
+            document_controller = test_context.create_document_controller()
+            document_model = document_controller.document_model
+            data_item = DataItem.DataItem(numpy.zeros((4, 4), numpy.uint32))
+            document_model.append_data_item(data_item)
+            display_item = document_model.get_display_item_for_data_item(data_item)
+            display_data_channel = display_item.display_data_channels[0]
+            display_data_channel.color_map_id = "__missing__"
+            Inspector.ImageDataInspectorModel(document_controller, display_data_channel, display_item)
+
     def test_inspector_handles_deleted_data(self):
         with TestContext.create_memory_context() as test_context:
             document_controller = test_context.create_document_controller()