message: Only load html_report if needed.
diff: @@ -9,8 +9,6 @@ import re # regexp package
  import shutil
  import tempfile
  -from html_report import graph_dirs
  -
  import perflib
  import timing
  @@ -815,6 +813,7 @@ def main(argv):
  #
  # HACK: problem file implies html report
  if problem_file:
  + from html_report import graph_dirs
  graph_dirs(outdirlist, problem_file, docdir)
  else:
  # otherwise, make other doc types using asymptote figs
  