[7.x][ML] Avoid NPE when node load is calculated on job assignment (#… #49214
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…49186)
This commit fixes a NPE problem as reported in #49150.
But this problem uncovered that we never added proper handling
of state for data frame analytics tasks.
In this commit we improve the
MlTasks.getDataFrameAnalyticsState
method to handle null tasks and state tasks properly.
Closes #49150
Backport of #49186