Made set_default_logger nullable in spec.yml

[kraenhansen]

What, How & Why?

Made set_default_logger nullable in spec.yml to allow the SDK to remove the default logger entirely.

☑️ ToDos

• 📝 Changelog update
• 🚦 Tests (or not relevant)
• C-API, if public C++ API changed
• bindgen/spec.yml, if public C++ API changed

[coveralls-official]

Pull Request Test Coverage Report for Build kraen.hansen_55

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 556 unchanged lines in 26 files lost coverage.
• Overall coverage decreased (-0.01%) to 91.819%

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Files with Coverage Reduction	New Missed Lines	%
src/realm/array_key.cpp	1	98.61%
src/realm/index_string.hpp	1	93.68%
src/realm/sync/client.hpp	1	97.67%
test/fuzz_tester.hpp	1	59.58%
src/realm/collection_parent.cpp	2	92.48%
src/realm/query_engine.hpp	2	93.73%
src/realm/sync/network/http.hpp	2	82.41%
test/test_lang_bind_helper.cpp	2	94.24%
src/realm/object-store/sync/sync_session.hpp	3	93.75%
src/realm/table.cpp	3	90.81%

Totals
Change from base Build 2165:	-0.01%
Covered Lines:	243111
Relevant Lines:	264772

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💛 - Coveralls