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${name:-default} returned the empty string when name was set to
nothing. POSIX uses the default in that case. A missing name already did.
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Purpose
${name:-default}is the POSIX form that uses the default whennameis unset or empty. An empty value was returned as itself.b=followed bya=${b:-d}producedaequal to"". The same input withbmissing already producedd.b=cstill staysc.${b}with no default stays empty.fixes #715
Test plan
pytest tests/test_variables.py tests/test_main.py::test_dotenv_values_string_io(29 passed)