Handle errors on add member to collection

[codecov[bot]]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (bf2fca1) 88.51% compared to head (404448b) 88.06%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #57 +/- ## ========================================== - Coverage 88.51% 88.06% -0.45% ========================================== Files 32 32 Lines 1724 1735 +11 Branches 120 120 ========================================== + Hits 1526 1528 +2 - Misses 175 184 +9 Partials 23 23 ``` | [Files](https://app.codecov.io/gh/uatuko/gatekeeper/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Uditha+Atukorala) | Coverage Δ | | |---|---|---| | [src/svc/collections.cpp](https://app.codecov.io/gh/uatuko/gatekeeper/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Uditha+Atukorala#diff-c3JjL3N2Yy9jb2xsZWN0aW9ucy5jcHA=) | `80.68% <30.76%> (-5.14%)` | :arrow_down: |

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