do not send Nones

dap/utils/bsreadext.py

@@ -22,6 +22,8 @@ def pack_bsread_data(orig, prefix, skip=None):
         elif isinstance(v, list):
             # bsread fails for empty lists and non-1D lists
             v = list_to_array(v)
+        if v is None:
+            continue
         data[f"{prefix}:{k}"] = v
     return data