Fix setting flags on servers with no PERMANENTFLAGS response (#1490087)

CHANGELOG

@@ -49,6 +49,7 @@ CHANGELOG Roundcube Webmail
 - Don't remove links when html signature is converted to text (#1489621)
 - Fix page title when using search filter (#1490023)
 - Fix mbox files import
+- Fix setting flags on servers with no PERMANENTFLAGS response (#1490087)
 
 RELEASE 1.0.3
 -------------

program/lib/Roundcube/rcube_imap_generic.php

@@ -2041,8 +2041,14 @@ class rcube_imap_generic
             $flag = $this->flags[strtoupper($flag)];
         }
 
-        if (!$flag || (!in_array($flag, (array) $this->data['PERMANENTFLAGS'])
-            && !in_array('\\*', (array) $this->data['PERMANENTFLAGS']))
+        if (!$flag) {
+            return false;
+        }
+
+        // if PERMANENTFLAGS is not specified all flags are allowed
+        if (!empty($this->data['PERMANENTFLAGS'])
+            && !in_array($flag, (array) $this->data['PERMANENTFLAGS'])
+            && !in_array('\\*', (array) $this->data['PERMANENTFLAGS'])
         ) {
             return false;
         }