Workaround for setLevel on undefined logger

[andrevmatos]

Try to fix #1232
Also, fixes logstore for errors on Firefox

[codecov]

Codecov Report

Merging #1245 into master will increase coverage by 0.64%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1245      +/-   ##
==========================================
+ Coverage   95.00%   95.65%   +0.64%     
==========================================
  Files         117      117              
  Lines        4145     4120      -25     
  Branches      850      842       -8     
==========================================
+ Hits         3938     3941       +3     
+ Misses        164      136      -28     
  Partials       43       43              

Flag	Coverage Δ
#dapp	90.83% <ø> (+2.12%)	⬆️
#sdk	97.56% <100.00%> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
raiden-dapp/src/utils/logstore.ts	20.00% <ø> (+13.02%)	⬆️
raiden-ts/src/polyfills.ts	100.00% <100.00%> (ø)
raiden-ts/src/raiden.ts	93.87% <100.00%> (-0.04%)	⬇️

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[nephix]

Thank you 👍

[kelsos]

lgtm