Only check for ullage on ModuleEnginesRF #1924
Merged
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When trying to check for ullage on a non-ModuleEnginesRF engine, VesselState sets the reflection fields to null; this causes the autostaging code to spam NREs and refuse to work.
This change makes sure that an engine is a (subclass of) ModuleEnginesRF before trying to access the ullage field.
Fixes #1921