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Cannot use pretrained 3D model #88

Description

@giocard

Hi,

when using the StarDIst 3D wrapper from the BIOP plugin in Fiji to use a pretrained model for prediction, I get the following error

Traceback (most recent call last):
  File "C:\Conda\envs\csbdeep\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Conda\envs\csbdeep\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Conda\envs\csbdeep\Scripts\stardist-predict3d.exe\__main__.py", line 7, in <module>
  File "C:\Conda\envs\csbdeep\lib\site-packages\stardist\scripts\predict3d.py", line 45, in main
    get_registered_models(StarDist3D, verbose=True)
  File "C:\Conda\envs\csbdeep\lib\site-packages\csbdeep\models\pretrained.py", line 68, in get_registered_models
    print("\u2500\u2500\u2500\u2500{s}\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500".format(s=' '*(_maxkeylen-4+3)))
  File "C:\Conda\envs\csbdeep\lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 0-3: character maps to <undefined>

It seems that the unicode character used at this line

print("────{s}─────────".format(s=' '*(_maxkeylen-4+3)))

is not recognized, at least on my Windows machine.

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