poeschko/Mathics — pull request #26 by cjiang (2012-06-17 06:11:35+00:00)
Title: Fix for Issue 19

Catches an uncaught sympy exception. Would be nicer to have to_sympy
re-throw a Mathics exception, this is the quick fix at least to prevent
Mathics from crashing.

Also some minor refactorings to make use of get_head_name().