Fix possible issues in skin/skin_path config handling (#1490125)

CHANGELOG

@@ -61,6 +61,7 @@ CHANGELOG Roundcube Webmail
 - Fix handling of UNKNOWN-CTE response, try do decode content client-side (#1490046)
 - Fix bug where creating subfolders in shared folders wasn't possible without ACL extension (#1490113)
 - Fix reply scrolling issue with text mode and start message below the quote (#1490114)
+- Fix possible issues in skin/skin_path config handling (#1490125)
 
 RELEASE 1.0.3
 -------------

program/include/rcmail_output_html.php

@@ -187,6 +187,8 @@ EOF;
             $valid = !$skin;
         }
 
+        $skin_path = rtrim($skin_path, '/');
+
         $this->config->set('skin_path', $skin_path);
         $this->base_path = $skin_path;
 

program/lib/Roundcube/rcube_plugin.php

@@ -422,7 +422,7 @@ abstract class rcube_plugin
         $rcube = rcube::get_instance();
         $skins = array_keys((array)$rcube->output->skins);
         if (empty($skins)) {
-            $skins = array($rcube->config->get('skin'));
+            $skins = (array) $rcube->config->get('skin', 'larry');
         }
         foreach ($skins as $skin) {
             $skin_path = 'skins/' . $skin;