[Bugfix] Fix the use of uninitialized variable in Par_EquilibriumIC

[hsinhaoHHuang]

Issue

The variable par in Par_EquilibriumIC::Set_Velocity() is uninitialized if k loops to params.Cloud_MassProfNBin-1 without ever sum_mes>sum_rad in the for loop.

The resulting velocity of that particle will be polluted and become something unpredictable.
This may lead to extremely large particle velocity and extremely small time-steps.

Change

Assign a value to par when k==params.Cloud_MassProfNBin-1 in a similar way.

Note

Related Issue:

• Improve Par_EquilibriumIC.cpp #295

Related PR:

• Improve Par_EquilibriumIC #315

[hyschive]

@hsinhaoHHuang Thanks for the careful check and the bug fix!