[Osi] OsiClp getBasics

[Matthew Galati]

I am using OsiClp in a normal manner. Load problem, solve, add some columns,
resolve, etc... Periodically, I want to get the basis header. I get the
following assertion failure. Do I need to do something special to get
basics? There is no error message, just a failed assertion.

decomp_gap: ../../../../Osi/src/OsiClp/OsiClpSolverInterface.cpp:6071:
virtual void OsiClpSolverInterface::getBasics(int*) const: Assertion
`modelPtr_->pivotVariable()' failed.
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