`get_header_image()` can return `false`. In `Custom_Image_Header->step_1()`, check the value before setting the `background-image` portion of the `style` attribute. Setting the the URL to empty string will cause the current request to be set as the source of the background image.
See #30799. Built from https://develop.svn.wordpress.org/trunk@31130 git-svn-id: http://core.svn.wordpress.org/trunk@31111 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -554,7 +554,14 @@ class Custom_Image_Header {
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call_user_func( $this->admin_image_div_callback );
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} else {
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$custom_header = get_custom_header();
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$header_image_style = 'background-image:url(' . esc_url( get_header_image() ) . ');';
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$header_image = get_header_image();
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if ( $header_image ) {
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$header_image_style = 'background-image:url(' . esc_url( $header_image ) . ');';
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} else {
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$header_image_style = '';
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}
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if ( $custom_header->width )
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$header_image_style .= 'max-width:' . $custom_header->width . 'px;';
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if ( $custom_header->height )
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@ -4,7 +4,7 @@
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*
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* @global string $wp_version
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*/
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$wp_version = '4.2-alpha-31129';
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$wp_version = '4.2-alpha-31130';
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/**
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* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
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