Removed Warn in cookie.go when cookie is empty

[kdamichie]

Removed warn log when no cookie

---

Which Traffic Control components are affected by this PR?

• Traffic Ops

What is the best way to verify this PR?

Verify that there is no warn log when cookie is missing or empty

If this is a bugfix, which Traffic Control versions contained the bug?

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[codecov]

Codecov Report

Merging #7513 (554168a) into master (e7dbab8) will decrease coverage by 37.91%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #7513       +/-   ##
=============================================
- Coverage     65.51%   27.60%   -37.91%     
  Complexity       98       98               
=============================================
  Files           309      686      +377     
  Lines         11822    77933    +66111     
  Branches        815       90      -725     
=============================================
+ Hits           7745    21515    +13770     
- Misses         3727    54398    +50671     
- Partials        350     2020     +1670     

Flag	Coverage Δ
golib_unit	48.58% <ø> (?)
grove_unit	4.60% <ø> (?)
t3c_unit	5.32% <ø> (?)
traffic_monitor_unit	21.28% <ø> (?)
traffic_ops_integration	69.42% <ø> (ø)
traffic_ops_unit	23.14% <ø> (?)
traffic_portal_v2	?
traffic_stats_unit	10.14% <ø> (?)
unit_tests	24.24% <ø> (-51.87%)	⬇️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.63% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
traffic_ops/traffic_ops_golang/tocookie/cookie.go	58.62% <ø> (ø)

... and 583 files with indirect coverage changes

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