message: Give default value to compileCommandsDirectory
diff: @@ -1464,8 +1464,7 @@ bool QueryDbMainLoop(Config* config,
  }
  // Make sure compile commands directory is valid.
  if (config->compileCommandsDirectory.empty()) {
  - LOG_S(ERROR) << "No compile commands directory";
  - exit(1);
  + config->compileCommandsDirectory = project_path;
  }
  config->cacheDirectory = NormalizePath(config->cacheDirectory);
  