[reporters][markdown] traceback when checking AmaticSC

Attempted to gen a markdown report for AmaticSC-Regular and got the following traceback.

Traceback (most recent call last):
  File "/Users/marc/Documents/googlefonts/fontbakery/venv/bin/fontbakery", line 9, in <module>
    load_entry_point('fontbakery==0.3.5.dev231+g127ce2e4', 'console_scripts', 'fontbakery')()
  File "/Users/marc/Documents/googlefonts/fontbakery/Lib/fontbakery/cli.py", line 24, in main
    "fontbakery.commands." + subcommand_module, run_name='__main__')
  File "/usr/local/Cellar/python/2.7.14_3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 192, in run_module
    fname, loader, pkg_name)
  File "/usr/local/Cellar/python/2.7.14_3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/Users/marc/Documents/googlefonts/fontbakery/Lib/fontbakery/commands/check_googlefonts.py", line 31, in <module>
    sys.exit(main())
  File "/Users/marc/Documents/googlefonts/fontbakery/Lib/fontbakery/commands/check_specification.py", line 285, in main
    args.ghmarkdown.write(mdr.get_markdown())
  File "/Users/marc/Documents/googlefonts/fontbakery/Lib/fontbakery/reporters/ghmarkdown.py", line 79, in get_markdown
    if self.omit_loglevel(check["result"]):
TypeError: list indices must be integers, not unicode

CLI I used was:

fontbakery check-googlefonts -l FAIL ./AmaticSC/fonts/ttf/AmaticSC-Regular.ttf -g *check --ghmarkdown plus.md

[m4rc1e]

Thank you for implementing this so quickly.

[m4rc1e]

These one are legit.

We can ignore overlapping contours and points not on extremes though.