Update plugin.py

[ali1rathore]

Handle case where item is a Section.

AttributeError: 'Section' object has no attribute 'file'

[coveralls]

Pull Request Test Coverage Report for Build 928166658

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 88.117%

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Totals
Change from base Build 926456783:	0.03%
Covered Lines:	393
Relevant Lines:	446

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💛 - Coveralls

[mondeja]

Released in v0.0.13.