Setting state with impossible internal energy / enthalpy does not generate errors

[speth]

Setting the state with u or h as one of the state variables where the value of u or h does not correspond to a physical value of T does not generate an error. Instead, it silently leaves the ThermoPhase object in a state which does not satisfy the input requirement. Examples:

import cantera as ct
gas = ct.Solution('h2o2.xml')
gas.TPX = 300, 101325, 'H2:1.0'
gas.HP = -4e6, 101325
print(gas.h)

returns -3786007.497. Similarly,

gas.UV = -4e6, 101325
print(gas.u)

returns -3786007.584