fix: check to see if target exists before deleting

[awwwd]

Signed-off-by: awwwd [email protected]

Fixes #109

API Validation in Postman

target1 exists in project1 but target2 doesn't

Now, Let's try to delete target2 to validate the PR changes

As we can see -- it's giving us 404 Not Found-

{
    "error_message": "target does not exist"
}

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[codecov-commenter]

Codecov Report

Merging #370 (4566905) into main (45f292b) will increase coverage by 0.16%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #370      +/-   ##
==========================================
+ Coverage   70.02%   70.18%   +0.16%     
==========================================
  Files          11       11              
  Lines        2042     2053      +11     
==========================================
+ Hits         1430     1441      +11     
  Misses        510      510              
  Partials      102      102              

Impacted Files	Coverage Δ
service/handlers.go	62.22% <100.00%> (+0.40%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 45f292b...4566905. Read the comment docs.