Check handling of svgz icons // QTox missing App Icon

[https://appimage.github.io/qTox/](https://appimage.github.io/qTox/)

If icon doesn't exist can we set "icons" to null?

` {
"name": "qTox",

"description": "Qt 5 based Tox instant messenger for secure communication",

"categories": ["Network"],
"authors" : [{"name":"qTox","url":"https://github.com/qTox"}],
"license" : "GPL-3.0",
"links": [{"type":"GitHub","url":"qTox/qTox"},{"type":"Download","url":"https://github.com/qTox/qTox/releases"}],
"icons": ["qTox/icons/scalable/qtox.svgz"],
"screenshots" : ["qTox/screenshot.png"]
}`

Should be this icon


taken from [https://github.com/qTox](https://github.com/qTox)