2 files changed, 36 insertions, 4 deletions
diff --git a/program/include/rcube_message.php b/program/include/rcube_message.php
index 8f1432fb8..745019e18 100644
--- a/program/include/rcube_message.php
+++ b/program/include/rcube_message.php
@@ -278,6 +278,32 @@ class rcube_message
 
 
     /**
+     * Checks if part of the message is an attachment (or part of it)
+     *
+     * @param rcube_message_part $part Message part
+     *
+     * @return bool True if the part is an attachment part
+     */
+    public function is_attachment($part)
+    {
+        foreach ($this->attachments as $att_part) {
+            if ($att_part->mime_id == $part->mime_id) {
+                return true;
+            }
+
+            // check if the part is a subpart of another attachment part (message/rfc822)
+            if ($att_part->mimetype == 'message/rfc822') {
+                if (in_array($part, (array)$att_part->parts)) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+
+    /**
      * Read the message structure returend by the IMAP server
      * and build flat lists of content parts and attachments
      *
diff --git a/program/include/rcube_session.php b/program/include/rcube_session.php
index 4ac395472..6916e2ba8 100644
--- a/program/include/rcube_session.php
+++ b/program/include/rcube_session.php
@@ -221,13 +221,14 @@ class rcube_session
    * Handler for session_destroy()
    *
    * @param string Session ID
+   *
    * @return boolean True on success
    */
   public function db_destroy($key)
   {
-    $this->db->query(
-      sprintf("DELETE FROM %s WHERE sess_id = ?", get_table_name('session')),
-      $key);
+    if ($key) {
+      $this->db->query(sprintf("DELETE FROM %s WHERE sess_id = ?", get_table_name('session')), $key);
+    }
 
     return true;
   }
@@ -308,11 +309,16 @@ class rcube_session
    * Handler for session_destroy() with memcache backend
    *
    * @param string Session ID
+   *
    * @return boolean True on success
    */
   public function mc_destroy($key)
   {
-    return $this->memcache->delete($key);
+    if ($key) {
+      $this->memcache->delete($key);
+    }
+
+    return true;
   }