Skip over broken TTF font when creating cache

[mdboom]

Fixes #5232.

[tacaswell]

python3 requires () on this.

[mdboom]

Doh!

[tacaswell]

back ported as 0cb18e0

[JGalvezTT]

I'm still getting the same error. When I try to

import matplotlib.font_manager

I get an error in the function

ttfFontProperty(Font)

on the line 396

[JGalvezTT]

I added ValueError at line 592. Seems to work now.

except KeyError, RuntimeError:

[tacaswell]

@JGalvezTT What version of mpl are you using?

[JGalvezTT]

@tacaswell, I'm using 1.5.1 on Anaconda. I got it to work by adding ValueError as an exception on the line 592. But now I'm getting error in other libraries (Opencv). So it might be that something is wrong on my set up.

[dov]

I also got this error on fedora 24, matplotlib version 1.5.2rc2. The bad font was "Truetypewriter PolyglOTT" font available from: http://www.fontsaddict.com/font/truetypewriter-polyglott.html . The error trace was:

/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
  warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
Traceback (most recent call last):
  File "<stdin>", line 20, in <module>
  File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py", line 29, in <module>
    import matplotlib.colorbar
  File "/usr/lib64/python2.7/site-packages/matplotlib/colorbar.py", line 34, in <module>
    import matplotlib.collections as collections
  File "/usr/lib64/python2.7/site-packages/matplotlib/collections.py", line 27, in <module>
    import matplotlib.backend_bases as backend_bases
  File "/usr/lib64/python2.7/site-packages/matplotlib/backend_bases.py", line 62, in <module>
    import matplotlib.textpath as textpath
  File "/usr/lib64/python2.7/site-packages/matplotlib/textpath.py", line 15, in <module>
    import matplotlib.font_manager as font_manager
  File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 1421, in <module>
    _rebuild()
  File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 1406, in _rebuild
    fontManager = FontManager()
  File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 1059, in __init__
    self.ttflist = createFontList(self.ttffiles)
  File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 590, in createFontList
    prop = ttfFontProperty(font)
  File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 396, in ttfFontProperty
    sfnt = font.get_sfnt()
ValueError: No SFNT name table

[tacaswell]

@dov can you make a new issue? This fell through the cracks for 1.5.x 😞

[dov]

Ok. I did. See: #6702 . Unfortunately I seem to have erased the font that caused the crash. :-(