Sergey Biryukov a5db52030f Query: Check if $wp_query is set in is_main_query(). ...

This avoids a PHP fatal error and triggers a `_doing_it_wrong()` notice if `is_main_query()` is called too early, bringing consistency with all the other `is_*()` conditionals: `is_single()`, `is_home()`, etc.

Follow-up to [16947], [17068], [17083], [18699], [37985].

Props vdankbaar, nhadsall, johnbillion, costdev, thijsoo, teunvgisteren, timkersten655, SergeyBiryukov.
Fixes #55104.
Built from https://develop.svn.wordpress.org/trunk@53395


git-svn-id: http://core.svn.wordpress.org/trunk@52984 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2022-05-14 15:10:14 +00:00

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