Fix stats page if releaseDate is missing

[enikonemeth]

No description provided.

[sensenet]

Site name	Url	Last deploy
sn-app-dev	https://6093a5eabd04b482c49efc70--sn-app-dev.netlify.app	Thu May 06 2021 - 08:16:43 GMT+0000 (Coordinated Universal Time)
sn-react-component-docs-dev	https://6093a5f3f7a1df87d1204fc5--sn-react-component-docs-dev.netlify.app	Thu May 06 2021 - 08:16:52 GMT+0000 (Coordinated Universal Time)

[codecov]

Codecov Report

Merging #1315 (e693500) into develop (622ea7a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1315   +/-   ##
========================================
  Coverage    93.50%   93.50%           
========================================
  Files          232      232           
  Lines         6317     6317           
  Branches      1676     1676           
========================================
  Hits          5907     5907           
  Misses         410      410           

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