Bug in `mepo update-state`

[mathomp4]

This is a bug found by @jpmailaddy . We broke mepo update-state recently. To demonstrate the issue, you need mepo 1 and 2. So let's go to discover. First load mepo 1 and clone a repo:

> ml other/mepo/1.52.0
> mepo clone git@github.com:GEOS-ESM/MAPL.git
> cd MAPL

Now, go to mepo 2 and run update-state:

> ml other/mepo/2.4.0
> mepo status
Checking status...
Detected mepo1 style state
Run <mepo update-state> to permanently convert to mepo2 style
MAPL       | (b) main
ESMA_env   | (t) v4.38.0 (DH)
ESMA_cmake | (t) v3.62.1 (DH)
ecbuild    | (t) geos/v1.4.0 (DH)
> mepo update-state
Detected mepo1 style state
Run <mepo update-state> to permanently convert to mepo2 style
Traceback (most recent call last):
  File "/discover/swdev/gmao_SIteam/mepo-pip/2.4.0/bin/mepo", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/gpfsm/dswdev/gmao_SIteam/mepo-pip/2.4.0/venvs/mepo/lib/python3.11/site-packages/mepo/__main__.py", line 15, in main
    cmd_module.run(args)
  File "/gpfsm/dswdev/gmao_SIteam/mepo-pip/2.4.0/venvs/mepo/lib/python3.11/site-packages/mepo/command/update-state.py", line 19, in run
    MepoState.write_state(allcomps)
  File "/gpfsm/dswdev/gmao_SIteam/mepo-pip/2.4.0/venvs/mepo/lib/python3.11/site-packages/mepo/state.py", line 158, in write_state
    allcomps_s.append(comp.serialize())
                      ^^^^^^^^^^^^^^^^
  File "/gpfsm/dswdev/gmao_SIteam/mepo-pip/2.4.0/venvs/mepo/lib/python3.11/site-packages/mepo/component.py", line 190, in serialize
    v = getattr(self, k)
        ^^^^^^^^^^^^^^^^
AttributeError: 'MepoComponent' object has no attribute 'blobless'