lb-run crashes when reporting incompatible platform

Same issue as in LbScripts:

Error: Traceback (most recent call last):
  File "/cvmfs/lhcb.cern.ch/lib/lhcb/LBSCRIPTS/LBSCRIPTS_v9r2p7/InstallArea/python/LbConfiguration/SP2/script.py", line 881, in main
    super(LbRun, self).main()
  File "/cvmfs/lhcb.cern.ch/lib/lhcb/LBSCRIPTS/LBSCRIPTS_v9r2p7/InstallArea/python/EnvConfig/__init__.py", line 277, in main
    self._makeEnv()
  File "/cvmfs/lhcb.cern.ch/lib/lhcb/LBSCRIPTS/LBSCRIPTS_v9r2p7/InstallArea/python/LbConfiguration/SP2/script.py", line 702, in _makeEnv
    os_id = LbPlatformUtils.os_id()
AttributeError: 'module' object has no attribute 'os_id'