handle var-create failure case in stackwalk (#678)
handle var-create failure case in stackwalk (#678)

* handle var-create failure case in stackwalk

* PR Feedback

orbitcowboy/MIEngine,Microsoft/MIEngine,Microsoft/MIEngine,orbitcowboy/MIEngine,chuckries/MIEngine,orbitcowboy/MIEngine,chuckries/MIEngine,chuckries/MIEngine,Microsoft/MIEngine,orbitcowboy/MIEngine,Microsoft/MIEngine,chuckries/MIEngine