Non-informative error message when an intervention in pre-spec planning is missing from intervention file

[willu47]

When an intervention is specified in a pre-specified planning strategy, but missing from an intervention listing, a KeyError is raised, should be a SmifDataNotFound error (or better).

Traceback (most recent call last):
  File "d:\lahiru\envs\nismod\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "d:\lahiru\envs\nismod\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\Lahiru\envs\nismod\Scripts\smif.exe\__main__.py", line 9, in <module>
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\cli\__init__.py", line 345, in main
    args.func(args)
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\cli\__init__.py", line 129, in run_model_runs
    execute_model_run(model_run_ids, store, args.warm)
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\controller\execute.py", line 32, in execute_model_run
    modelrun.run(store)
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\controller\modelrun.py", line 137, in run
    modelrunner.solve_model(self, store)
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\controller\modelrun.py", line 180, in solve_model
    for bundle in decision_manager.decision_loop():
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\decision\decision.py", line 191, in decision_loop
    self._get_and_save_bundle_decisions(bundle)
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\decision\decision.py", line 210, in _get_and_save_bundle_decisions
    self.get_and_save_decisions(iteration, timestep)
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\decision\decision.py", line 240, in get_and_save_decisions
    decisions.extend(self.pre_spec_planning.get_decision(results_handle))
  File "d:\lahiru\envs\nismod\lib\site-packages\smif\decision\decision.py", line 402, in get_decision
    data = self._register[intervention['name']]
KeyError: '20_Didcot_GT_retire'