eyes test fixes

mantidimaging/gui/windows/live_viewer/model.py

@@ -24,8 +24,9 @@ class DaskImageDataStack:
     """
     A Dask Image Data Stack Class to hold a delayed array of all the images in the Live Viewer Path
     """
-    delayed_stack: dask.array.Array
+    delayed_stack: dask.array.Array | None = None
     image_list: list[Image_Data]
+    create_delayed_array: bool
 
     def __init__(self, image_list: list[Image_Data], create_delayed_array: bool = True):
         self.image_list = image_list
@@ -53,11 +54,11 @@ def get_delayed_arrays(self) -> list[dask.array.Array] | None:
         else:
             return None
 
-    def get_delayed_image(self, index) -> dask.array.Array:
-        return self.delayed_stack[index]
+    def get_delayed_image(self, index: int) -> dask.array.Array | None:
+        return self.delayed_stack[index] if self.delayed_stack else None
 
-    def get_image_data(self, index) -> Image_Data:
-        return self.image_list[index]
+    def get_image_data(self, index: int) -> Image_Data | None:
+        return self.image_list[index] if self.image_list else None
 
 
 class Image_Data:

mantidimaging/gui/windows/live_viewer/presenter.py

@@ -41,7 +41,7 @@ def __init__(self, view: LiveViewerWindowView, main_window: MainWindowView):
         self.main_window = main_window
         self.model = LiveViewerWindowModel(self)
         self.selected_image: Image_Data | None = None
-        self.selected_delayed_image: dask.array.Array
+        self.selected_delayed_image: dask.array.Array | None
 
         self.filters = {f.filter_name: f for f in load_filter_packages()}
 
@@ -86,7 +86,7 @@ def select_image(self, index: int) -> None:
 
         self.display_image(self.selected_image, self.selected_delayed_image)
 
-    def display_image(self, image_data_obj: Image_Data, delayed_image: dask.array.Array) -> None:
+    def display_image(self, image_data_obj: Image_Data, delayed_image: dask.array.Array | None) -> None:
         """
         Display image in the view after validating contents
         """
@@ -109,12 +109,15 @@ def display_image(self, image_data_obj: Image_Data, delayed_image: dask.array.Ar
         self.view.live_viewer.show_error(None)
 
     @staticmethod
-    def load_image(delayed_image: dask.array.Array) -> np.ndarray:
+    def load_image(delayed_image: dask.array.Array | None) -> np.ndarray:
         """
         Load a .Tif, .Tiff or .Fits file only if it exists
         and returns as an ndarray
         """
-        image_data = delayed_image.compute()
+        if delayed_image:
+            image_data = delayed_image.compute()
+        else:
+            raise ValueError
         return image_data
 
     def update_image_modified(self, image_path: Path) -> None: