fix for consumer errors in app #166

[patkivikram]

This fixes the errors seen in #166

[codecov-commenter]

Codecov Report

Merging #167 (e3fe807) into master (6f8f0b7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   94.53%   94.53%           
=======================================
  Files         100      100           
  Lines       10628    10629    +1     
  Branches     1201     1201           
=======================================
+ Hits        10047    10048    +1     
  Misses        512      512           
  Partials       69       69           

Impacted Files	Coverage Δ
faust/transport/consumer.py	95.75% <100.00%> (+<0.01%)	⬆️

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