fix wrong filename in critical log message

Script/CopyThread.py

@@ -141,7 +141,7 @@ class CopyThread(threading.Thread):
                     if exc.errno == errno.ENOENT:
                         # The file has been removed by an external cause.
                         # This is bad but this is not a reason to crash.
-                        self.logger.critical('error getting local file size %s: not present (deleted by external cause)', copyfile[0] + Constants.tobecopied_ext)
+                        self.logger.critical('error getting local file size %s: not present (deleted by external cause)', copyfile[0])
                         # delete associated file (ignoring errors)
                         try:
                             os.remove(copyfile[0] + Constants.tobecopied_ext)