fix(nav): allow having falsy values like 0 and 'false' for nav ids

[maxokorokov]

Fixes #3569

[codecov-io]

Codecov Report

Merging #3571 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3571      +/-   ##
==========================================
+ Coverage    91.7%   91.71%   +<.01%     
==========================================
  Files         100      100              
  Lines        2895     2896       +1     
  Branches      533      533              
==========================================
+ Hits         2655     2656       +1     
  Misses        183      183              
  Partials       57       57

Flag	Coverage Δ
#e2e	56.59% <0%> (-0.02%)	⬇️
#unit	88.49% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
src/nav/nav.ts	100% <100%> (ø)	⬆️

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