fix(api): ticket: handle out of bounds (not found)

[ssiyad]

closes #1405

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.03% 🎉

Comparison is base (6453da4) 13.16% compared to head (1e08aaa) 13.20%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1417      +/-   ##
==========================================
+ Coverage   13.16%   13.20%   +0.03%     
==========================================
  Files          56       56              
  Lines        1967     1962       -5     
==========================================
  Hits          259      259              
+ Misses       1708     1703       -5     

Files Changed	Coverage Δ
helpdesk/helpdesk/doctype/hd_ticket/api.py	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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