message: Add dummy compiler argument.
diff: @@ -348,6 +348,8 @@ std::vector<Project::Entry> LoadFromDirectoryListing(Config* init_opts,
  e.directory = config->project_dir;
  e.file = file;
  e.args = GetCompilerArgumentForFile(file);
  + if (e.args.empty())
  + e.args.push_back("%clang"); // Add a Dummy.
  e.args.push_back(e.file);
  result.push_back(
  GetCompilationEntryFromCompileCommandEntry(init_opts, config, e));
  