TestNamespacedMerkleTree_calculateAbsenceIndex_Panic isn’t complete

[andrijamitrovic23]

TestNamespacedMerkleTree_calculateAbsenceIndex_Panic obviously isn’t complete. It does not push the data from test cases to the nmt. It passes (the tested function panics as expected) because it tests an empty tree so this panic will be called in both cases. So this test does not test the given cases. Push function should be called for the given data.

One test case should added that tests the panic if the tree is empty, as it is done unintentionally in this test.