Failure to build

[Connor-Bowley]

This extension fails to build after the Midas server holding its test data was discontinued.

CMake Error at /home/connor/gitlocal/salt/SlicerSALT-build/slicersources-src/CMake/ExternalData.cmake:1113 (message):
  

  Object MD5=fc4c9d7e37040e6b446eaa328597e5f5 not found at:

    https://github.com/Slicer/SlicerTestingData/releases/download/MD5/fc4c9d7e37040e6b446eaa328597e5f5 ("HTTP response code said error")
    http://slicer.kitware.com/midas3/api/rest?method=midas.bitstream.download&checksum=fc4c9d7e37040e6b446eaa328597e5f5 ("HTTP response code said error")

Recommend getting needed data onto https://github.com/Slicer/SlicerTestingData