Query: Avoid PHP notices when `get_queried_object()` returns `null`.

`WP_Query` methods assume that `get_queried_object()` would return a non-null value, which is not always the case.

This commit resolves various warnings in `WP_Query` along the lines of:
{{{
Attempt to read property "post_type" on null in wp-includes/class-wp-query.php on line 4338
}}}

Follow-up to [1728], [3639], [8807], [49119].

Props dd32, yellyc, boonebgorges, darkskipper, Howdy_McGee, swissspidy, nacin, mikeschroder, mikejolley, sterlo, datainterlock, utsavmadaan823, kanlukasz, woji29911, hellofromTonya, zikubd, deksar, bwbama, noplanman, nouarah, SergeyBiryukov.
Fixes #29660.
Built from https://develop.svn.wordpress.org/trunk@54496


git-svn-id: http://core.svn.wordpress.org/trunk@54055 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-query.php

@@ -3963,6 +3963,9 @@ class WP_Query {
 		$attachment = array_map( 'strval', (array) $attachment );
 
 		$post_obj = $this->get_queried_object();
+		if ( ! $post_obj ) {
+			return false;
+		}
 
 		if ( in_array( (string) $post_obj->ID, $attachment, true ) ) {
 			return true;
@@ -3996,6 +3999,9 @@ class WP_Query {
 		}
 
 		$author_obj = $this->get_queried_object();
+		if ( ! $author_obj ) {
+			return false;
+		}
 
 		$author = array_map( 'strval', (array) $author );
 
@@ -4032,6 +4038,9 @@ class WP_Query {
 		}
 
 		$cat_obj = $this->get_queried_object();
+		if ( ! $cat_obj ) {
+			return false;
+		}
 
 		$category = array_map( 'strval', (array) $category );
 
@@ -4068,6 +4077,9 @@ class WP_Query {
 		}
 
 		$tag_obj = $this->get_queried_object();
+		if ( ! $tag_obj ) {
+			return false;
+		}
 
 		$tag = array_map( 'strval', (array) $tag );
 
@@ -4315,6 +4327,9 @@ class WP_Query {
 		}
 
 		$page_obj = $this->get_queried_object();
+		if ( ! $page_obj ) {
+			return false;
+		}
 
 		$page = array_map( 'strval', (array) $page );
 
@@ -4422,6 +4437,9 @@ class WP_Query {
 		}
 
 		$post_obj = $this->get_queried_object();
+		if ( ! $post_obj ) {
+			return false;
+		}
 
 		$post = array_map( 'strval', (array) $post );
 
@@ -4469,6 +4487,9 @@ class WP_Query {
 		}
 
 		$post_obj = $this->get_queried_object();
+		if ( ! $post_obj ) {
+			return false;
+		}
 
 		return in_array( $post_obj->post_type, (array) $post_types, true );
 	}

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta3-54495';
+$wp_version = '6.1-beta3-54496';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.