Don't run mpmath pylab tests, if pylab fails to import
Don't run mpmath pylab tests, if pylab fails to import

It's important to also test that figure() can be created, because that can fail
too, if the backend is not installed or not working (over ssh for example).

Also use the "disabled" feature, instead of just printing some error on the
screen, as it used to be.

Signed-off-by: Ondrej Certik <b816faa87b7d35274d2e545c5be11ed4376f3ccf@certik.cz>

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