Don't show lines for absent metadata when adding a custom filter

[Alex-302]

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• Filters were updated before reproducing an issue
• I checked the knowledge base and found no answer
• I checked to make sure that this issue has not already been filed

AdGuard Extension version

5.0.172

Browser version

131.0.6778.86

OS version

Windows 10 x64

Ad Blocking

AdGuard Base filter

Privacy

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Social

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Annoyances

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Security

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Other

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Language-specific

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What Tracking protection options do you have enabled?

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Issue Details

Steps to reproduce:

1. Import a filter with incomplete metadata.

For example:

! Title: User filter
! Download URL: http://192.168.88.102/work/AG_User_Filter.txt
!
exampple.com##body

replace URL by existing.

Expected Behavior

Don't show lines for absent metadata when adding a custom filter

Actual Behavior

Lines without values are displayed

Screenshots

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Additional Information

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