Add null safety check for protobuf deserializer

[blockvote]

No description provided.

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master       #8   +/-   ##
=========================================
  Coverage     80.52%   80.52%           
- Complexity      106      108    +2     
=========================================
  Files            15       15           
  Lines           380      380           
  Branches         63       63           
=========================================
  Hits            306      306           
  Misses           37       37           
  Partials         37       37

Impacted Files	Coverage Δ	Complexity Δ
...o/moia/router/proto/ProtoDeserializationHandler.kt	83.33% <100%> (ø)	6 <3> (+2)	⬆️

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[mduesterhoeft]

Thanks - 👍 Would you mind adding a test for this case?

[blockvote]

Thanks - 👍 Would you mind adding a test for this case?

Done!