When seec::trace::FunctionState::getCurrentRuntimeValue() returns a nullptr, make getValue() return a null Value. This fixes an issue where seec::cm::FunctionState::getStmtValue() would sometimes return a Value for an Instruction that had not been evaluated (or was outdated).
When seec::trace::FunctionState::getCurrentRuntimeValue() returns a nullptr,
make getValue() return a null Value. This fixes an issue where
seec::cm::FunctionState::getStmtValue() would sometimes return a Value for an
Instruction that had not been evaluated (or was outdated).

seec-team/seec,mheinsen/seec,seec-team/seec,mheinsen/seec,seec-team/seec,mheinsen/seec,seec-team/seec,mheinsen/seec,mheinsen/seec,seec-team/seec