Bugfix: convert UUID_BINARY in pk on update

[mringler]

Fixes issue in comment.

I have also changed the UuidConverter, so that it handles null values. The initial idea was to be strict with the type, but it is not robust and lead to ugly code, where the null check has to be performed manually every time.

Includes test fix from #1980, otherwise tests would fail.

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Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.27%. Comparing base (4f36eea) to head (6b29c6d).
⚠️ Report is 70 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Propel/Generator/Builder/Om/ObjectBuilder.php	90.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1981   +/-   ##
=========================================
  Coverage     89.27%   89.27%           
- Complexity     8049     8052    +3     
=========================================
  Files           232      232           
  Lines         24519    24527    +8     
=========================================
+ Hits          21889    21897    +8     
  Misses         2630     2630           

Flag	Coverage Δ
5-max	89.27% <93.75%> (+<0.01%)	⬆️
7.4	89.27% <93.75%> (+<0.01%)	⬆️
agnostic	67.47% <68.75%> (+<0.01%)	⬆️
mysql	69.81% <87.50%> (+<0.01%)	⬆️
pgsql	69.92% <87.50%> (+0.08%)	⬆️
sqlite	67.88% <87.50%> (+0.08%)	⬆️

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