mutation_branch::load uses cata::nullopt as default for optional values #42965
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ZhilkinSerg
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[C++]
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Summary
SUMMARY: None
Purpose of change
Fixes an oversight from #42932
Describe the solution
Since the load method does the actual initializing of the values, it needs to pass cata::nullopt as default or else the changes from the other PR are mostly pointless.
Describe alternatives you've considered
Testing
Tested if values were actually cata::nullopt before and after the changes.
Additional context