btRigidBody with all-zero m_linearFactor and non-zero m_angularFactor will not collide with onther static objects

[JiangboYu13]

A btRigidBody with all zero m_linearFactor but non-zero m_angularFactor should still collide with other static objects which changes the angular velocity. But due to the code in btSequentialImpulseConstraintSolver.cpp:
solverBody->internalSetInvMass(btVector3(rb->getInvMass(), rb->getInvMass(), rb->getInvMass()) * rb->getLinearFactor()); in btSequentialImpulseConstraintSolver::initSolverBody
and
if (!solverBodyA || (solverBodyA->m_invMass.fuzzyZero() && (!solverBodyB || solverBodyB->m_invMass.fuzzyZero()))) in btSequentialImpulseConstraintSolver::convertContact
the collision will not occur

[bgossage]

The expression:
if (m_angularFactor)
{
...
}
is always true. Looks like the compiler implicitly casts "operator btScalar *()" from pointer to bool.