WIP fix when only one image type

nabu/resources/dataset_analyzer.py

@@ -305,7 +305,7 @@ class FlatFieldLoader:
         """
         diffs = np.diff(image_keys == key)
         indices = np.arange(diffs.size)[diffs]
-        assert indices.size % 2 == 0
+        assert indices.size % 2 == 0 # Fails when only 1 image
         indices += 1
         slices = []
         for i in range(0, indices.size, 2):