OAIDataProvider throws NPE if database is empty

Description

If I go to /servlets/OAIDataProvider having a fresh installed MIR without any documents, I get the following StackTrace:

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Created November 18, 2018 at 7:49 PM
Updated December 19, 2018 at 8:29 AM
Resolved December 7, 2018 at 11:22 AM