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Initialize the aggregation builder stages property with an empty array #257
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This will fix a PHP warning when calling `getPipeline()` on an Aggregation builder without any stages since array_map expects an array as second argument, but the `$stages` property is still `null`. The new behaviour is consistent with the Query builder, which also returns an empty array.
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This will fix a PHP warning when calling
getPipeline()on an Aggregationbuilder without any stages since array_map expects an array as second argument, but the
$stagesproperty is still
null. The new behaviour is consistent with the Query builder, which alsoreturns an empty array.