Fix PHP fatal error when visiting Vacation interface and there's no sieve script yet

plugins/managesieve/Changelog

@@ -1,3 +1,5 @@
+- Fix PHP fatal error when visiting Vacation interface and there's no sieve script yet
+
 * version 8.2 [2015-01-14]
 -----------------------------------------------------------
 - Fix bug where actions without if/elseif/else in sieve scripts were skipped

plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php

@@ -2344,12 +2344,12 @@ class rcube_sieve_engine
      */
     protected function init_script()
     {
-        $this->script = $this->sieve->script->as_array();
-
-        if (!$this->script) {
+        if (!$this->sieve->script) {
             return;
         }
 
+        $this->script = $this->sieve->script->as_array();
+
         $headers    = array();
         $exceptions = array('date', 'currentdate', 'size', 'body');
 

plugins/managesieve/lib/Roundcube/rcube_sieve_vacation.php

@@ -562,11 +562,20 @@ class rcube_sieve_vacation extends rcube_sieve_engine
                 $this->script_name = 'roundcube';
             }
 
-            $this->script = array($rule);
-            $script_active = false;
+            // use default script contents
+            if (!$this->rc->config->get('managesieve_kolab_master')) {
+                $script_file = $this->rc->config->get('managesieve_default');
+                if ($script_file && is_readable($script_file)) {
+                    $content = file_get_contents($script_file);
                 }
-        // if script exists
-        else {
+            }
+
+            // create and load script
+            if ($this->sieve->save_script($this->script_name, $content)) {
+                $this->sieve->load($this->script_name);
+            }
+        }
+
         $script_active = in_array($this->script_name, $this->active);
 
         // re-order rules if needed
@@ -616,6 +625,9 @@ class rcube_sieve_vacation extends rcube_sieve_engine
                 }
             }
         }
+
+        if (!$this->sieve->script) {
+            return false;
         }
 
         $this->sieve->script->content = $this->script;