Fix DAG reply for AI.TENSORGET op

[alonre24]

Fix bug in DAG reply for ai.tensorget op when the op was not executed due to an error that occurred beforehand. In this case we should return immediately return 'NA'.

[codecov]

Codecov Report

Merging #793 (ce2402a) into master (0000228) will increase coverage by 6.29%.
The diff coverage is 81.77%.

@@            Coverage Diff             @@
##           master     #793      +/-   ##
==========================================
+ Coverage   74.11%   80.41%   +6.29%     
==========================================
  Files          39       52      +13     
  Lines        6081     7888    +1807     
==========================================
+ Hits         4507     6343    +1836     
+ Misses       1574     1545      -29     

Impacted Files	Coverage Δ
src/redis_ai_types/model_type.c	70.00% <ø> (ø)
src/redis_ai_types/script_type.c	70.00% <ø> (+5.00%)	⬆️
src/redis_ai_types/tensor_type.c	73.33% <ø> (ø)
src/serialization/AOF/rai_aof_rewrite.c	0.00% <0.00%> (ø)
tests/module/DAG_utils.c	88.23% <ø> (ø)
tests/module/LLAPI.c	74.46% <ø> (ø)
tests/unit/rmalloc.h	100.00% <ø> (ø)
tests/unit/unit_tests_err.cpp	100.00% <ø> (ø)
src/backends/libtflite_c/tflite_c.cpp	57.60% <35.71%> (ø)
src/backends/tflite.c	66.01% <57.14%> (+2.19%)	⬆️
... and 77 more

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