updateSection bug on hasRoles\n

[zhixzhan]

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Describe the bug

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To Reproduce

Steps to reproduce the behavior:

1. prepare a lu file end with hasRoles\n:

#WhoAreYou
- my name is {@userName=luhan}
@ prebuilt personName hasRoles
`;

2. update the section with section content

#WhoAreYou
- my name is {@userName=luhan}
@ prebuilt personName hasRoles userName

3. see error from luParser sectionOperator

Expected behavior

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Additional context

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[bug]