Using exists instead of count is faster.

[nshaibu]

No description provided.

[codecov-commenter]

Codecov Report

Merging #244 (a0b3981) into develop (afa0287) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #244   +/-   ##
========================================
  Coverage    99.89%   99.89%           
========================================
  Files           56       56           
  Lines         1989     1989           
  Branches       287      288    +1     
========================================
  Hits          1987     1987           
  Misses           1        1           
  Partials         1        1           

Impacted Files	Coverage Δ
comment/managers/comments.py	100.00% <100.00%> (ø)

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[abhiabhi94]

thanks for the contribution!