Core: Fix tests around empty namespaces #11962
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I bisected this and looked why this test started to fail after it was merged to main. The reason is that with #11761 we changed namespace existence check for the REST catalog, which in turn does a namespace validation check. Prior to #11761 that validation error would be caught in
iceberg/api/src/main/java/org/apache/iceberg/catalog/SupportsNamespaces.java
Line 161 in 1ea1852