Include .has-no-blocks body class on archive and search results pages.

[jamiemitchell]

The .has-no-block helper function in the Gutenberg init.php doesn't show on archive and search results pages.

Even though the archive or search results page contain blocks themselves within the posts, I think the archive and search results pages should still include the .has-no-blocks body class as these aren't actually editable pages.

So if we were to use the .has-no-blocks body class for Gutenberg block page specific styling like for example:

body:not(.has-no-blocks) .entry-content {
    /* Do some Gutenberg block page specific styling
        which could include margins, padding or widths  */
}

Then those styles would also get applied to posts on archive and search results pages too where this block page specific styling should not be included.

[jamiemitchell]

Just a suggestion, but in lib/gutenberg/init.php possibly change:

	if ( ! has_blocks() ) {
		$classes[] = 'has-no-blocks';
		return $classes;
	}

to:

	if ( has_blocks()  ) {
		$classes[] = 'has-blocks';
	}

Because if the Gutenberg init.php is disabled, then any styles added to the main stylesheet for '.has-no-blocks' will no longer work.

Where as the 'has-blocks' class is 100% Gutenberg specific for folks who may want to style block pages different, remove paddings, margins, width etc too.

As an example:

.has-blocks .site-inner {
    max-width: 100%;
    padding: 0;
}

.has-blocks .entry-content > * {
    margin-left: auto;
    margin-right: auto;
    padding-left: 20px;
    padding-right: 20px;
    max-width: 760px;
}

.has-blocks .entry-content > .alignwide {
    max-width: 1160px;
}

Makes block page styling super easy.

Hope this helps.