fixed invalid model get reponse

[DvirDukhan]

closes #557

[codecov]

Codecov Report

Merging #558 (699eb0c) into master (247c4e5) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #558      +/-   ##
==========================================
+ Coverage   74.52%   74.57%   +0.05%     
==========================================
  Files          35       35              
  Lines        5644     5648       +4     
==========================================
+ Hits         4206     4212       +6     
+ Misses       1438     1436       -2     

Impacted Files	Coverage Δ
src/command_parser.c	91.83% <100.00%> (-0.05%)	⬇️
src/model.c	78.48% <100.00%> (ø)
src/redisai.c	83.15% <100.00%> (+0.12%)	⬆️
src/backends/tensorflow.c	67.77% <0.00%> (+0.60%)	⬆️

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[lantiga]

LGTM