Fix isinstance arg 2 must be a type error (scverse#2209)

* Fix isinstance arg 2 must be a type error * fix markdown * Use dummy class Co-authored-by: Isaac Virshup <[email protected]>
dshefter · Apr 5, 2022 · 14d65b4 · 14d65b4
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diff --git a/docs/release-notes/1.9.1.md b/docs/release-notes/1.9.1.md
@@ -6,5 +6,7 @@
 ```{rubric} Bug fixes
 ```
 
+- {func}`~scanpy.pp.normalize_total` works when Dask is not installed {pr}`2209` {smaller}`R Cannoodt`
+
 ```{rubric} Ecosystem
 ```
diff --git a/scanpy/preprocessing/_normalization.py b/scanpy/preprocessing/_normalization.py
@@ -9,7 +9,10 @@
 try:
     from dask.array import Array as DaskArray
 except ImportError:
-    DaskArray = None
+
+    class DaskArray:
+        pass
+
 
 from scanpy import logging as logg
 from scanpy._compat import Literal