[#4987] Fix crash in updateDistance updating LOD on null mVObjp #4988
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Issue: #4987
This PR simply null checks mVObjp before calling updateLOD to try prevent the viewer from crashing.
Note: If this function should return much earlier in the case of mVObjp being null, or some alternative to alleviate this issue, please provide a suggestion on what to do instead and I'll update this PR.