[Cbc] Crash in postprocessing model with missing column names.

[David Einstein]

The attached code crashes with the following stack trace

#0  0x00000031c9ebefcb in std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string(std::string const&) () from
/lib64/libstdc++.so.6
#1  0x0000000000454419 in __gnu_cxx::new_allocator<std::string>::construct
(this=0x7fff32c8dd10, __p=0x3ea79a0,
    __val=<error reading variable: Cannot access memory at address
0xffffffffffffffe8>) at /usr/include/c++/4.8.2/ext/new_allocator.h:130
#2  0x00000000004530fc in
__gnu_cxx::__alloc_traits<std::allocator<std::string>
>::construct<std::string> (__a=..., __p=0x3ea79a0,
    __arg=<error reading variable: Cannot access memory at address
0xffffffffffffffe8>) at /usr/include/c++/4.8.2/ext/alloc_traits.h:216
#3  0x0000000000452600 in std::vector<std::string,
std::allocator<std::string> >::push_back (this=0x7fff32c8dd10,
    __x=<error reading variable: Cannot access memory at address
0xffffffffffffffe8>) at /usr/include/c++/4.8.2/bits/stl_vector.h:905
#4  0x000000000072843f in ClpPresolve::gutsOfPresolvedModel
(this=0x2dbecd0, originalModel=0x285a3a0, feasibilityTolerance=1e-08,
keepIntegers=true, numberPasses=5,
    dropNames=false, doRowObjective=false, prohibitedRows=0x0,
prohibitedColumns=0x0) at ../../../coin-Cbc/Clp/src/ClpPresolve.cpp:2418
#5  0x000000000072049e in ClpPresolve::presolvedModel (this=0x2dbecd0,
si=..., feasibilityTolerance=1e-08, keepIntegers=true, numberPasses=5,
dropNames=false,
    doRowObjective=false, prohibitedRows=0x0, prohibitedColumns=0x0) at
../../../coin-Cbc/Clp/src/ClpPresolve.cpp:119
#6  0x000000000069d343 in OsiClpSolverInterface::initialSolve
(this=0x2859910) at
../../../../coin-Cbc/Clp/src/OsiClp/OsiClpSolverInterface.cpp:231
#7  0x000000000062a8ff in CglPreProcess::postProcess (this=0x7fff32c905d0,
modelIn=..., deleteStuff=true) at
../../../../coin-Cbc/Cgl/src/CglPreProcess/CglPreProcess.cpp:3862
#8  0x0000000000437bef in CbcMain1 (argc=7, argv=0x7fff32c96980, model=...,
callBack=0x41f4aa <dummyCallBack(CbcModel*, int)>, parameterData=...)
    at ../../../coin-Cbc/Cbc/src/CbcSolver.cpp:6648
#9  0x000000000041fe92 in CbcMain1 (argc=7, argv=0x7fff32c96980, model=...,
callBack=0x41f4aa <dummyCallBack(CbcModel*, int)>) at
../../../coin-Cbc/Cbc/src/CbcSolver.cpp:1289
#10 0x000000000041fb90 in CbcMain1 (argc=7, argv=0x7fff32c96980, model=...)
at ../../../coin-Cbc/Cbc/src/CbcSolver.cpp:1159
#11 0x00000000004062f8 in main (argc=1, argv=0x7fff32c97c18) at
galton11.cpp:295

Removing the #if 0 .. #endif on lines 246 and 249 makes things run well.
 Turning off preprocessing also works.  I suspect that I should have built
the model as an OsiClpSolverInterface directly instead of building a
ClpSimplex and constructing the OsiClpSolverInterface from that.
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