[Go] Perform empty string check on string fields when packing objects #7719
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Co-authored-by: Derek Bailey <derekbailey@google.com>
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In C++, CreateX allows to write the default "" value of a required string, when the string is not explicitly set. Object API Pack method uses this implementation of CreateX. However, in go, despite whether the field is optional or required, it is always checked against empty string allowing to create messages that fail to pass the verifier. This commits partially reverts flatbuffers/google#7719 when the string field is required.
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In C++, CreateX allows to write the default "" value of a required string, when the string is not explicitly set. Object API Pack method uses this implementation of CreateX. However, in go, despite whether the field is optional or required, it is always checked against empty string allowing to create messages that fail to pass the verifier. This commits partially reverts google#7719 when the string field is required.
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Fixes #7709