Fix bugs writing MPS/LP files when there are no constraints

jonls / qsopt-ex

QSopt_ex - an exact linear programming solver. This is a fork adding improvements to the build system, library and a Python interface.

GNU General Public License v3.0

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Closed jonls closed 7 years ago

jonls commented 7 years ago

Fixes writing LP file with no constraints. Previously an empty file was written when the problem had no constraints.
Fixes writing MPS file with no constraints. Previously an error was reported.
Add additional tests for writing files.