Add a message when autocomplete is empty

Hm. Not sure, this seems to be the standard behavior for autocomplete in core? Also, the way this is implement makes it a selectable option, which is a bit weird?

+++ b/pm_block_user/pm_block_user.testundefined
@@ -54,8 +54,12 @@ class PrivatemsgBlockUserCase extends PrivatemsgBaseTestCase {
+    $test = count($autocomplete) == 1
+      && key($autocomplete) == $blocked_user->name
+      && current($autocomplete) == '<em>' . t('Sorry no matches were found for "@fragment".', array('@fragment' => $blocked_user->name)) . '</em>';
+    $this->assertTrue($test, t('User with blocked role does not appear in autocomplete results.'));

I would create separate assertions for this. This looks a) ugly and is unnecessary hard to debug when one of those assertions is no longer true.

+++ b/privatemsg.pages.incundefined
@@ -796,6 +796,9 @@ function privatemsg_autocomplete($string) {
+    $suggestions[$prefix . $fragment] = '<em>' . t('Sorry no matches were found for "@fragment".', array('@fragment' => $fragment)) . '</em>';

No need for "Sorry".

#9: privatemsg-add_string_on_empty_autocomplete-1954496-9-test-only.patch queued for re-testing.

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