catch possible exceptions of mapOutputs function

[Phill101]

fix for #1138
Idea is catch every exception that may happen in function that provided to Endpoint#mapOutput from Mapper.

[codecov-io]

Codecov Report

Merging #1142 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1142   +/-   ##
=======================================
  Coverage   80.51%   80.51%           
=======================================
  Files          54       54           
  Lines        1016     1016           
  Branches       32       32           
=======================================
  Hits          818      818           
  Misses        198      198

Impacted Files	Coverage Δ
core/src/main/scala/io/finch/internal/Mapper.scala	100% <100%> (ø)	⬆️
core/src/main/scala/io/finch/Endpoint.scala	72.57% <100%> (ø)	⬆️

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[sergeykolbasov]

Thanks, @Phill101!
LGTM

/cc @vkostyukov @rpless

[sergeykolbasov]

Would you like to add a spec that reproduces & covers #1138?

[Phill101]

added small fix

Would you like to add a spec that reproduces & covers #1138?

yep. In progress

[rpless]

@sergeykolbasov Yeah this LGTM as well.

[vkostyukov]

This is great, thanks @Phill101!

[Phill101]

Added test. Probably it has not better name.

[sergeykolbasov]

Thanks, @Phill101! I think it's good