[BD-46] docs: fix Paragon's version generation in dependent-usage.json

[viktorrusakov]

Description

Fixes Paragon's version value in dependent-usage.json to be "" when it was not found in the cloned repo. Previously we defaulted to {} in such cases which breaks docs site build.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (37abee5) 91.81% compared to head (6c6f139) 91.81%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2658   +/-   ##
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  Coverage   91.81%   91.81%           
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  Files         235      235           
  Lines        4217     4217           
  Branches     1020     1020           
=======================================
  Hits         3872     3872           
  Misses        341      341           
  Partials        4        4           

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🎉 This PR is included in version 21.3.0 🎉

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[edx-semantic-release]

🎉 This PR is included in version 22.0.0-alpha.7 🎉

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