Media: Disable the edit image->replace button when no item selected.

On the edit media screen, ensure that the 'replace' button is disabled until a media item is selected. Fix an issue where clicking the button with no item selected threw a JavaScript error and failed to work.

Props timmydcrawford, subrataemfluence, psiico.
Fixes #40589.



git-svn-id: https://develop.svn.wordpress.org/trunk@40902 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/media-views.js

@@ -5116,6 +5116,7 @@ ImageDetails = Select.extend({
 					style:    'primary',
 					text:     l10n.replace,
 					priority: 80,
+					requires: { selection: true },
 
 					click: function() {
 						var controller = this.controller,

src/wp-includes/js/media/views/frame/image-details.js

@@ -146,6 +146,7 @@ ImageDetails = Select.extend({
 					style:    'primary',
 					text:     l10n.replace,
 					priority: 80,
+					requires: { selection: true },
 
 					click: function() {
 						var controller = this.controller,