Finding OSTYPE if not exists

[mojtaba-komeili]

While trying to install mephisto metrics, ran into issues with empty OSTYPE env variable. This fixes that by checking it exists.

[JackUrb]

Thanks for getting to the bottom of this @mojtaba-komeili!

[codecov-commenter]

Codecov Report

Merging #892 (37c44bf) into main (f8bf7b1) will decrease coverage by 0.37%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #892      +/-   ##
==========================================
- Coverage   64.68%   64.31%   -0.38%     
==========================================
  Files         108      108              
  Lines        9320     9269      -51     
==========================================
- Hits         6029     5961      -68     
- Misses       3291     3308      +17     

Impacted Files	Coverage Δ
...tractions/architects/channels/websocket_channel.py	67.96% <0.00%> (-8.60%)	⬇️
mephisto/data_model/assignment.py	57.48% <0.00%> (-4.24%)	⬇️
mephisto/operations/hydra_config.py	50.60% <0.00%> (-1.73%)	⬇️
mephisto/abstractions/architect.py	62.85% <0.00%> (-1.04%)	⬇️
...s/remote_procedure/remote_procedure_agent_state.py	38.98% <0.00%> (-1.02%)	⬇️
.../blueprints/parlai_chat/parlai_chat_task_runner.py	24.50% <0.00%> (-0.99%)	⬇️
...to/abstractions/blueprints/mixins/use_gold_unit.py	30.34% <0.00%> (-0.95%)	⬇️
...tractions/blueprints/mixins/onboarding_required.py	73.77% <0.00%> (-0.84%)	⬇️
mephisto/data_model/agent.py	74.25% <0.00%> (-0.83%)	⬇️
...sto/abstractions/providers/mturk/mturk_provider.py	50.00% <0.00%> (-0.69%)	⬇️
... and 19 more

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