fix(dag): avoid getting dataset next run info for unresolved dataset alias #41828
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Why
In #41453, we change the condition to get dataset next run info from
self.schedule_interval != "Dataset"
toself.dataset_expression is None:
which won't work for "Unresolved Dataset Alias" as they don't have dataset info to get yet.What
Do not get dataset next run info if it's an unresolved dataset alias
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