Console Error generating with model merging on (" TypeError: sequence item 1: expected str instance, NoneType found") about sd-webui-model-mixer

[wkpark]

wow, the merging speed looks very fast!

>>> ",".join(["a",None,"b"])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: sequence item 1: expected str instance, NoneType found

don't know why but it seems the second model (model_b) has an empty shorthash.
2b0ab87 commit simply ignore empty hash and check some invalid case.

※ added: newly added checkpoints but never loaded/used have an empty shorthash.

[CCpt5]

Actually, the images that are generated appear to be from the model selected at the top of the page not the merged file that Model Mixer was supposed to make (or any partial mix including the items selected it its dropdown).