[fix] - Creating article with filtered category

[alikon]

Pull Request for Issue #17974 .

Summary of Changes

one category only

Testing Instructions

Expected result

no error

[ghost]

I have tested this item 🔴 unsuccessfully on daf04fb

Using Patch gives in Test Scenario:

System information

3.8.1-dev
Multilanguage Site
macOS Sierra, 10.12.6
Firefox 55 (64-bit)

MAMP 4.1.1

• PHP 7.0.15
• MySQLi 5.6.35

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[Shazrina1994]

for me eventhough after making changes to code also gives me the same like @franz-wohlkoenig.
$data->catid[0] this part of code no make any sense for me. not sure