issue warnings instead of fatal exceptions

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Originally reported by: Mark Mikofski (Bitbucket: bwanamarko, GitHub: Unknown)

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if possible, continue to build don't crash!

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• Bitbucket: https://bitbucket.org/bwanamarko/sphinxcontrib-matlabdomain/issue/12

[joeced]

Original comment by Mark Mikofski (Bitbucket: bwanamarko, GitHub: Unknown):

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issue #13 is very similar to this, and several other issues would be affected by this. They are grouped in this milestone

[joeced]

Fixed in 1a50005ab492415ca99028e24235986111a7f84a