Fix: JsonDataException on NULL embed height

[andsala]

Fixes issue #247

[codecov]

Codecov Report

Merging #248 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #248   +/-   ##
========================================
  Coverage      0.53%   0.53%           
  Complexity        7       7           
========================================
  Files           120     120           
  Lines          2237    2237           
  Branches        282     282           
========================================
  Hits             12      12           
  Misses         2224    2224           
  Partials          1       1

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/net/dean/jraw/models/LiveUpdate.java	0% <ø> (ø)	0 <0> (ø)	⬇️

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[mattbdean]

LGTM, thanks!