The metaball 'mesh' is animated whenever any of its components are animated.
However, it's not easily possible to visit all its components (AFAIK it
requires a full scan of all objects in the scene and comparing names), so
due to the blobby nature of the metaballs I now simply assume they'll be
animated.
This fixes an issue where a metaball was considered static when the base
ball was static. For example, MBall static but MBall.001 animated would
be considered 'not animated'.
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