- Improve handling of situation when FETCH returns OK, but no data

program/include/rcube_imap.php

@@ -1962,6 +1962,10 @@ class rcube_imap
 
         $headers = $this->get_headers($uid, $mailbox);
 
+        // message doesn't exist?
+        if (empty($headers))
+            return null; 
+
         // structure might be cached
         if (!empty($headers->structure))
             return $headers;
@@ -2382,15 +2386,11 @@ class rcube_imap
             $o_part->charset       = rcube_imap_generic::getStructurePartCharset($structure, $part);
         }
 
-        // TODO: Add caching for message parts
-
-        if (!$part) {
-            $part = 'TEXT';
+        if ($o_part && $o_part->size) {
+            $body = $this->conn->handlePartBody($this->mailbox, $uid, true,
+                $part ? $part : 'TEXT', $o_part->encoding, $print, $fp);
         }
 
-        $body = $this->conn->handlePartBody($this->mailbox, $uid, true, $part,
-            $o_part->encoding, $print, $fp);
-
         if ($fp || $print) {
             return true;
         }

program/include/rcube_imap_generic.php

@@ -2393,8 +2393,10 @@ class rcube_imap_generic
         $len    = strlen($line);
         $result = false;
 
+        if ($a[2] != 'FETCH') {
+        }
         // handle empty "* X FETCH ()" response
-        if ($line[$len-1] == ')' && $line[$len-2] != '(') {
+        else if ($line[$len-1] == ')' && $line[$len-2] != '(') {
             // one line response, get everything between first and last quotes
             if (substr($line, -4, 3) == 'NIL') {
                 // NIL response