crashes if classdef docstring is not indented

[joeced]

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

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see #13 or #12, this should be a silent error, not a build failure!

should I relax this condition?

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• Bitbucket: https://bitbucket.org/bwanamarko/sphinxcontrib-matlabdomain/issue/14

[joeced]

It is perfectly okay MATLAB code to not indent the docstring. This condition should be removed.