fix: Not break if tabBarExtraContent is empty object

[zombieJ]

No description provided.

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[codecov]

Codecov Report

Merging #411 (eae3ee3) into master (0e9f8ab) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #411   +/-   ##
=======================================
  Coverage   99.45%   99.45%           
=======================================
  Files          13       13           
  Lines         551      554    +3     
  Branches      140      139    -1     
=======================================
+ Hits          548      551    +3     
  Misses          3        3           

Impacted Files	Coverage Δ
src/TabNavList/index.tsx	99.47% <100.00%> (+<0.01%)	⬆️

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[lgtm-com]

This pull request introduces 1 alert when merging eae3ee3 into 0e9f8ab - view on LGTM.com

new alerts:

• 1 for Useless conditional