Unfriendly error message when (wrongly) specifying --hodconf

[SamDM]

Using a custom hod configuration, and specifying the configuration directory instead of the hod.conf file gives the following cryptic error message:

$ hod create --hodconf $HOME/Intro_course/hod_hadoop_spark --label hadoopSpark --job-walltime=1
Traceback (most recent call last):
  File "/usr/lib64/python2.6/runpy.py", line 122, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib64/python2.6/runpy.py", line 34, in _run_code
    exec code in run_globals
  File "build/bdist.linux-x86_64/egg/hod/main.py", line 92, in <module>
  File "build/bdist.linux-x86_64/egg/hod/main.py", line 80, in main
  File "build/bdist.linux-x86_64/egg/hod/subcommands/create.py", line 105, in run
  File "/usr/lib/python2.6/site-packages/vsc/utils/fancylogger.py", line 314, in raiseException
    message += " (%s)" % detail

the hod utility should be able figure out you are not giving it the correct file and then show a helpful error message.