[BE] Added usage of failtrace debug flag

[kabdelhak]

• BackendEquation.solveEquation

[CLAassistant]

All committers have signed the CLA.

[OpenModelica-Hudson]

The tests run correctly according to OpenModelica_TEST_PULL_REQUEST 2018-04-11_18-16-17.

[lochel]

Welcome @kabdelhak. Thanks for your first contribution.
Why do you want to hide the error message? Is the function supposed to fail and the test suite doesn't cover that case?

[kabdelhak]

Thank you, the commit was manly for me to get to used to the whole GIT-process. I stumpled upon it and asked Willi Braun about what that might be and we figured, that the function is allowed to fail and is not a crucial error. We thought it should just be shown if explicitly asked for. Am 08.05.18 12:55 schrieb Lennart Ochel <notifications@github.com>:

…

Welcome @kabdelhak(https://github.com/kabdelhak). Thanks for your first contribution. Why do you want to hide the error message? Is the function supposed to fail and the test suite doesn't cover that case? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub(#2357 (comment)), or mute the thread(https://github.com/notifications/unsubscribe-auth/AkRS_UoyP5cauOFho0Jx-He6e-9YEuvnks5twXmzgaJpZM4TQMiW).

[lochel]

@kabdelhak, @wibraun Do you have a model where this function actually fails? It should obviously fail for algorithms, when equations, and if equations. However, if it is not expected to reach one of these cases, then I would rather keep the error message explicit.

[wibraun]

@lochel It depends on the usage of this function. If one would like to use it as a try and in failing case do something else, than the error message is totally misleading, especially for end-users. So I think it's okay to hide it. In the new removeSimpleEquations module is used like that and therefore I proposed to hide the error messages instead of having them in all related tests.