Fix for . after non-extension uploads of files.

includes/common.php

@@ -190,8 +190,12 @@ function upload($files, $CONF, $db)
         $file_used = true;
         while ($file_used)
         {
-          $randomString = rand_string(6);
-          $fileURL = $randomString.".".$ext;
+          $randomString = rand_string(6);
+          if (empty($ext)) {
+            $fileURL = $randomString;
+          } else {
+            $fileURL = $randomString.".".$ext;
+          }
           $result = $db->select("uploads", "url=?", array($fileURL));
           if (!$result)
           {