fix: the issue when initialize SDK without global attribute

[zhu-xiaowei]

Description

1. fix the issue when initialize SDK without global attribute

The flutter official doc also has this problem, opened an issue for is.

General Checklist

• Added new tests to cover change, if needed
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2bd5583) to head (7c54c84).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #11   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           99        99           
=========================================
  Hits            99        99           

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