matlab codegen crash for unscaled problems

[goulart-paul]

Matlab crashes when calling osqp.codegen() if user sets

settings.scaling = 0.

The crash occurs in the call to osqp_mex('get_workspace')

Example

%small problem
P = sparse([4., 1.; 1., 2.]);
q = [1; 1];
A = sparse([1., 1; 1, 0; 0, 1]);
l = [1.0; 0.0; 0.0];
u = [1.0; 0.7; 0.7];

%1 = ok, 0 = crash
settings.scaling = 0;

% Solve with osqp and export
solver = osqp;
solver.setup(P, q, A, l, u, settings);
solver.solve();

%crashes here
solver.codegen('export', 'project_type','Xcode','parameters', 'matrices', 'mexname', 'emosqp');

[bstellato]

When scaling is disabled, the scaling structure is not allocated. The workspace renderer was trying to access the scaling variables even when they did not exist causing the crash in both Python and Matlab.

It is now fixed af59e25