Warn when deleting multisite user with no blog roles (#408)

* Show error message when multisite user to delete has no blog roles(#403)

* Fix tests and phpcs

* Replace --yes removed to test

* Specify expected output on subsite user delete

* Make subsite user delete test less specific

features/user.feature

@@ -152,6 +152,26 @@ Feature: Manage WordPress users
     Then STDERR should not be empty
     And the return code should be 1
 
+  Scenario: Trying to delete existing user with no roles from a subsite
+    Given a WP multisite install
+
+    When I run `wp user create bobjones bob@example.com --role=author --url=https://example.com --porcelain`
+    And save STDOUT as {BOB_ID}
+
+    When I run `wp user delete bobjones --yes`
+    Then STDOUT should contain:
+      """
+      Success: Removed user
+      """
+    And STDERR should be empty
+
+    When I try `wp user delete bobjones --yes`
+    Then STDERR should be:
+      """
+      Warning: No roles found for user {BOB_ID} on https://example.com, no users deleted.
+      """
+    And the return code should be 1
+
   @require-wp-4.0
   Scenario: Trying to delete super admin
     Given a WP multisite install

src/User_Command.php

@@ -295,6 +295,9 @@ function ( $user ) use ( $network, $reassign ) {
 				if ( $network ) {
 					$result  = wpmu_delete_user( $user_id );
 					$message = "Deleted user {$user_id}.";
+				} elseif ( is_multisite() && empty( $user->roles ) ) {
+					$message = "No roles found for user {$user_id} on " . home_url() . ', no users deleted.';
+					return [ 'error', $message ];
 				} else {
 					$result  = wp_delete_user( $user_id, $reassign );
 					$message = "Removed user {$user_id} from " . home_url() . '.';