message: Fixed a bug when the XACC install directory is not accessible
  The directory should be ".", not empty. Otherwise, the logger will try to write to the root directory.
diff: @@ -211,7 +211,7 @@ void XACCLogger::createFileLogger() {
  if (!directoryExists(logDir)) {
  if (!makeDirectory(logDir)) {
  // Cannot make the directory, use the current directory instead.
  - logDir = "";
  + logDir = ".";
  }
  }
  