Improve error checks when we start a watch

[DavyLandman]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.7%. Comparing base (e4e29a0) to head (81a085a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/engineering/swat/watch/Watch.java	66.6%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #68     +/-   ##
=========================================
+ Coverage     79.6%   79.7%   +0.1%     
- Complexity     174     176      +2     
=========================================
  Files           23      23             
  Lines          766     770      +4     
  Branches        88      89      +1     
=========================================
+ Hits           610     614      +4     
  Misses          95      95             
  Partials        61      61             

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[sungshik]

LGTM!