simplify error handling

Co-authored-by: Niko Sirmpilatze <[email protected]>

brainglobe_utils/IO/image/load.py

@@ -783,17 +783,12 @@ def read_with_dask(path):
             filenames = [line.rstrip() for line in f.readlines()]
 
     else:
-        filenames_tif = glob.glob(os.path.join(path, "*.tif"))
-        filenames_tiff = glob.glob(os.path.join(path, "*.tiff"))
-        if filenames_tif:
-            filenames = filenames_tif
-        elif filenames_tiff:
-            filenames = filenames_tiff
-        else:
-            raise (
-                ValueError(
-                    f"Folder {path} does not contain any .tif or .tiff files"
-                )
+        filenames = glob.glob(os.path.join(path, "*.tif")) or glob.glob(
+            os.path.join(path, "*.tiff")
+        )
+        if not filenames:
+            raise ValueError(
+                f"Folder {path} does not contain any .tif or .tiff files"
             )
 
     shape, dtype = get_tiff_meta(filenames[0])