#20838: Better error message if libhomfly not installed
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   Reporter:  kcrisman            |            Owner:
       Type:  defect              |           Status:  new
   Priority:  minor               |        Milestone:  sage-7.3
  Component:  packages: optional  |         Keywords:
  Merged in:                      |          Authors:
  Reviewers:                      |  Report Upstream:  N/A
Work issues:                      |           Branch:
     Commit:                      |     Dependencies:
   Stopgaps:                      |
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 When I do
 {{{
 L.homfly_polynomial()
 }}}
 I just get
 {{{
 ImportError: No module named homily
  }}}
 That should give me a message to do the optional package instead, I think.

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Ticket URL: <http://trac.sagemath.org/ticket/20838>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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