simple pylint fixes

[marksmayo]

from recently introduced code

[codecov-commenter]

Codecov Report

Base: 95.36% // Head: 95.36% // No change to project coverage 👍

Coverage data is based on head (f0dfd3c) compared to base (2c0e188).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #166   +/-   ##
=======================================
  Coverage   95.36%   95.36%           
=======================================
  Files          80       80           
  Lines        4663     4663           
=======================================
  Hits         4447     4447           
  Misses        216      216           

Impacted Files	Coverage Δ
rocketry/core/schedule.py	93.63% <ø> (ø)
rocketry/session.py	98.17% <ø> (ø)
rocketry/args/builtin.py	98.22% <100.00%> (ø)
rocketry/conditions/api.py	97.38% <100.00%> (ø)
rocketry/core/parameters/parameters.py	97.00% <100.00%> (ø)
rocketry/core/task.py	92.23% <100.00%> (ø)

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