[FIX] Kill mail detection from zKillboard's API response.

[ppfeufer]

Description

Fixed

• Kill mail detection from zKillboard's API response.
  Under certain circumstances,
  the zKillboard API returns more than one kill mail in the response,
  which caused an error in the SRP request form.
  This has been fixed now. (Bug reported to zKillboard)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 52.66%. Comparing base (ed3c16e) to head (97bda19).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
- Coverage   53.05%   52.66%   -0.38%     
==========================================
  Files          21       21              
  Lines        1216     1225       +9     
  Branches      100      104       +4     
==========================================
  Hits          645      645              
- Misses        562      571       +9     
  Partials        9        9              

Files	Coverage Δ
aasrp/views/general.py	41.55% <20.00%> (-0.40%)	⬇️
aasrp/managers.py	39.73% <11.12%> (-4.21%)	⬇️

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