fix potential issue with setting geoNear.query to undefined #6696
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Fixes a potential issue as reported in #6540.
$geoNear.query
parameter will not be set toundefined
if no query is given.Even though the issue in #6540 could not be reproduced (test cases passed for MongoDB 4.0.4, 4.3.2 when
$geoNear.query
parameter is set toundefined
) the issue may occur only with certain MongoDB versions or in certain setups.