[ML] Prevent potential NPE when reading the model memory limit #35827
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This error is very hard to recreate and can only happen during a rolling upgrade from 5.6 or 6.0. This is impractical to unit test as it is impossible to create a situation where
analysisLimitscan be null in the current code base, this was possible in previous versions.v6.6.0 has changed to use a different mechanism to discover the model memory limit so this fix does not need to be forward ported to any other branches.