fix(Map): fitBounds values that are undefined/null

[sebholstein]

fixes #1505
fixes #1504

[codecov]

Codecov Report

Merging #1506 into master will increase coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1506      +/-   ##
==========================================
+ Coverage   28.95%   28.99%   +0.03%     
==========================================
  Files          32       32              
  Lines        1454     1452       -2     
  Branches      197      197              
==========================================
  Hits          421      421              
+ Misses       1031     1029       -2     
  Partials        2        2

Impacted Files	Coverage Δ
packages/core/directives/map.ts	0% <0%> (ø)	⬆️

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