Problems while searching for a new upstream version

package:
vtk7
severity:
high
created:
2018-11-24
last updated:
2019-05-22

uscan had problems while searching for a new upstream version:
In debian/watch no matching files for watch line
  https://github.com/Kitware/VTK/tags .*/v?(7\.\d\S*)\.(?:tgz|tbz2|txz|tar\.(?:gz|bz2|xz))