fix(SmartMap): fixed null value error

[alisahinozcelik]

No description provided.

[codecov]

Codecov Report

Merging #29 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   99.39%   99.39%           
=======================================
  Files          42       42           
  Lines         333      333           
  Branches       56       57    +1     
=======================================
  Hits          331      331           
  Misses          2        2           

Impacted Files	Coverage Δ
src/smart-map.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 851b799...b83f629. Read the comment docs.