[Merge] ~kabak-85/ubuntu/+source/ristretto:ubuntu/focal into ubuntu/+source/ristretto:ubuntu/devel

[Robie Basak]

You have been requested to review the proposed merge of ~kabak-85/ubuntu/+source/ristretto:ubuntu/focal into ubuntu/+source/ristretto:ubuntu/devel.

For more details, see:
https://code.launchpad.net/~kabak-85/ubuntu/+source/ristretto/+git/ristretto/+merge/433198

Add a NULL value check.

g_file_info_get_content_type is nullable => https://developer-old.gnome.org/gio/unstable/GFileInfo.html#g-file-info-get-content-type 

When the filetype is unknown, it's return a null value/pointer that make crash at the "strncmp" instruction.

-- 
Your team Ubuntu Sponsors Team is requested to review the proposed merge of ~kabak-85/ubuntu/+source/ristretto:ubuntu/focal into ubuntu/+source/ristretto:ubuntu/devel.
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