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

Conflicts:
	CHANGELOG

CHANGELOG

@@ -1,6 +1,8 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix setting flags on servers with no PERMANENTFLAGS response (#1490087)
+
 RELEASE 1.0.3
 -------------
 - Fix insert-signature command in external compose window if opened from inline compose screen (#1490074)

program/lib/Roundcube/rcube_imap_generic.php

@@ -2002,8 +2002,14 @@ 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;
         }