Show error when Sphinx is unavailable.

Show error to the user instead of misleading "no results"
when Sphinx server is unavailable.

sphinx_plugin/includes/search/fulltext_sphinx.php

@@ -439,7 +439,7 @@ function split_keywords(&$keywords, $terms)
 	*/
 	function keyword_search($type, $fields, $terms, $sort_by_sql, $sort_key, $sort_dir, $sort_days, $ex_fid_ary, $m_approve_fid_ary, $topic_id, $author_ary, $author_name, &$id_ary, $start, $per_page)
 	{
-		global $config, $db, $auth;
+		global $config, $db, $auth, $user;
 
 		// No keywords? No posts.
 		if (!strlen($this->search_query) && !sizeof($author_ary))
@@ -563,6 +563,11 @@ function keyword_search($type, $fields, $terms, $sort_by_sql, $sort_key, $sort_d
 			usleep(CONNECT_WAIT_TIME);
 			$result = $this->sphinx->Query($search_query_prefix . str_replace('"', '"', $this->search_query), $this->indexes);
 		}
+		if (!$result)
+		{
+			$user->add_lang('mods/fulltext_sphinx');
+			trigger_error($user->lang['FULLTEXT_SPHINX_SERVER_ERROR']);
+		}
 
 		$id_ary = array();
 		if (isset($result['matches']))

sphinx_plugin/language/en/mods/fulltext_sphinx.php

@@ -64,6 +64,7 @@
 	'FULLTEXT_SPHINX_WRONG_DATABASE'		=> 'The sphinx plugin for phpBB currently only supports MySQL',
 	'FULLTEXT_SPHINX_STOPWORDS_FILE'		=> 'Stopwords activated',
 	'FULLTEXT_SPHINX_STOPWORDS_FILE_EXPLAIN'	=> 'This setting only works with autoconf enabled. You can place a file called sphinx_stopwords.txt containing one word in each line in your config directory. If this file is present these words will be excluded from the indexing process.',
+	'FULLTEXT_SPHINX_SERVER_ERROR'			=> 'There has been an error accessing the search server. Please try again in a few minutes.',
 ));
 
 ?>