message: [contour] Only watch on KDE's kcmfonts if it does exist.
diff: @@ -232,6 +232,7 @@ namespace
  #if !defined(__APPLE__) && !defined(_WIN32)
  auto const xdgConfigHome = config::configHome("");
  auto const kcmFontsFile = xdgConfigHome / "kcmfonts";
  + if (FileSystem::exists(kcmFontsFile))
  return { kcmFontsFile };
  #endif
  