NullPointerException when downloading AppResource from Appstore

[ftgyi2cat]

Describe the bug
When trying to deploy a Data App in the Connector, the Connector downloads the AppResource from the Appstore.
The artifact class in the appstore is missing the fileName field, and that gives a null pointer when the connector tries to parse the data.

To Reproduce
Download a data app from the connector. The error comes from line 243 in AdditionalUtils.java, when trying to do:
(Artifact) list.get(0)).getFileName();

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