fix: parse argument when say content is blank

[HardyNLee]

介绍

修复连续对话为空时, 第一个参数会被当做内容的问题

label:loop;
测试对话测试对话测试对话测试对话测试对话测试对话:这是第一行字|这是第二行字|这是第三行字|这是第四行字|这是第五行字|这是第六行字;
;这是注释
 ;有空格的注释
;下面这一行有个空格
 
;下面这一行什么都没有

;如果有参数, 应该作为say
 -arg=123;
测试对话:这是一段话[这是一段话](ruby=156156153)这是一段话这是一段话这是一段话这是一段话这是一段话这是一段话这是一段话这是一段话;
jumpLabel:loop;

[gemini-code-assist]

Summary of Changes

Hello @HardyNLee, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在解决scriptParser模块中的一个解析错误。此前，如果say内容为空或仅包含空白字符，解析器会错误地将后续的参数（例如-arg=123）识别为注释。本次修复通过调整空白字符的处理时机，确保只有在实际内容为空时才将其视为注释，从而保证参数能够被正确识别和处理，提高了脚本解析的健壮性。

Highlights

• 解析逻辑修复: 修复了当对话内容为空白时，解析器错误地将后续参数识别为注释的问题，确保参数能够被正确解析。
• 空白字符处理优化: 调整了对原始语句进行空白字符处理的逻辑，将trim()操作从初始赋值移至判断语句是否为空的条件中，从而更精确地判断内容是否为空。

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[gemini-code-assist]

Code Review

这个 Pull Request 修复了当连续对话内容为空时，参数被错误地解析为内容的问题。通过将对原始语句的 .trim() 操作延后，确保了在解析参数时能够正确识别以空格开头的参数部分，从而避免了将参数误认为内容。这是一个正确的修复，解决了描述中提到的问题。代码变更很简洁，逻辑清晰。