Hi!

FancyGetopt.generate_help crashes if help text in option_table is None:

instance = FancyGetopt([('long', 'l', None)])
help_text = instance.generate_help()

TypeError                                 Traceback (most recent call last)
<ipython-input-40-04e4e328455e> in <module>
----> 1 a.generate_help()

/usr/local/Cellar/python/3.7.2_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/distutils/fancy_getopt.py in generate_help(self, header)
    352                                  (max_opt, opt_names, text[0]))
    353                 else:
--> 354                     lines.append("  --%-*s" % opt_names)
    355
    356             for l in text[1:]:

TypeError: * wants int

This code is in master branch too.

And if help_text is empty string code behavior is like a help_text is actually pass and added 2 whitespaces.