message: ENH: use hard-coded version if blt_git_tag() fails
  Axom tags exist on master. If the master branch does not exist
  locally, blt_git_tag() fails. Modified the code to handle this
  gracefully and just use the hard-coded version info.
diff: @@ -57,16 +57,8 @@ if (Git_FOUND)
  ## get latest tag from master
  blt_git_tag( OUTPUT_TAG axom_tag RETURN_CODE rc ON_BRANCH master )
  - if ( NOT ${rc} EQUAL 0)
  - message( FATAL_ERROR "blt_git_tag failed!" )
  - endif()
  -
  + if ( {rc} EQUAL 0)
  axom_extract_version( "${axom_tag}" AXOM )
  -
  - ## check current active branch
  - blt_git_branch( BRANCH_NAME axom_branch RETURN_CODE rc )
  - if ( NOT ${rc} EQUAL 0 )
  - message( FATAL_ERROR "blt_git_branch failed!" )
  endif()
  blt_git_hashcode( HASHCODE sha1 RETURN_CODE rc )
  