Fix empty json error and string length error

[leowrites]

Proposed Changes

• Fixed [] will crash the program with error Error: Reduce of empty array with no initial value
• Fixed incorrect display of text when the style has a different text font
  ...

Screenshots of your changes (if applicable)

Type of Change

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Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)	x
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)	x
📚 Documentation update (change that only updates documentation)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

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[coveralls]

Pull Request Test Coverage Report for Build 11461349128

Details

• 10 of 10 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 88.857%

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Totals
Change from base Build 11432064566:	0.2%
Covered Lines:	425
Relevant Lines:	458

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💛 - Coveralls