HTTP 400 on Zuweisung when "Kein vergangener Meldezeitraum"

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Describe the bug

To Reproduce
Steps to reproduce the behavior:

1. Have no last meldezeitraum
2. Open Zuweisung

Expected behavior

• No Error on Backend - Just Empty Object or specific Response
• No UI Error, just the Text "Kein vergangener Meldezeitraum"