luParser sectionHandler return value not consistent

[zhixzhan]

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Describe the bug

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When I have a QnA file not include imports like:

>  [import](guide.source.qna)

# ?With Windows 10
'''
**With Windows 10**

Published: September 2020
'''

Do deleteSection return

When I have a QnA file include imports like:

[import](guide.source.qna)

# ?With Windows 10
'''
**With Windows 10**

Published: September 2020
'''

Do deleteSection return

To Reproduce

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4. See error

Expected behavior

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[bug]