Fix error with React Native

[Shiranuit]

What does this PR do ?

Fixes an edge case happening with react-native.

Frameworks like react-native sometimes emulate the window object when running outside of the browser,
this causes an edge case where the window object exists but window.location doesn't since there is no pages in an iOS / Android application for example.
This caused our debug utility to call new URL on an undefined value throwing an error,
This was preventing the usage of the SDK with react-native like in the issue #703.

[codecov]

Codecov Report

Merging #718 (fdb9750) into 7-dev (a7b70a8) will decrease coverage by 0.03%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##            7-dev     #718      +/-   ##
==========================================
- Coverage   83.21%   83.18%   -0.04%     
==========================================
  Files          45       45              
  Lines        2085     2087       +2     
  Branches      397      397              
==========================================
+ Hits         1735     1736       +1     
- Misses        272      273       +1     
  Partials       78       78              

Impacted Files	Coverage Δ
src/utils/debug.js	57.14% <71.42%> (-1.20%)	⬇️

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