bsread cannot handle object arrays

dap/utils/bsreadext.py

@@ -31,8 +31,8 @@ def list_to_array(x):
         # let numpy figure out the dtype
         return np.array(x)
     except ValueError:
-        # the above fails for ragged lists, which need to be object arrays
-        return np.array(x, dtype=object)
+        # the above fails for ragged lists but bsread also cannot handle object arrays
+        return None