Fixes #336

[khdesai]

No description provided.

[codecov-io]

Codecov Report

Merging #346 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
+ Coverage    98.1%   98.17%   +0.06%     
==========================================
  Files         124      124              
  Lines       14185    14159      -26     
==========================================
- Hits        13916    13900      -16     
+ Misses        269      259      -10

Impacted Files	Coverage Δ
stix2/test/v21/test_observed_data.py	100% <ø> (ø)	⬆️
stix2/v21/observables.py	96.93% <100%> (-0.21%)	⬇️
stix2/properties.py	98.36% <0%> (+0.54%)	⬆️
stix2/utils.py	97.72% <0%> (+1.13%)	⬆️
stix2/base.py	98.85% <0%> (+1.14%)	⬆️
stix2/canonicalization/Canonicalize.py	61.44% <0%> (+1.2%)	⬆️

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[clenk]

LGTM!