Fix checks for non-empty VB key Errant `else` for the locked case on devices from 202504 and before. Bug: 417544067 Bug: 403136259 Test: atest CtsKeystoreTestCases:android.keystore.cts.KeyAttestationTest Flag: EXEMPT bugfix Change-Id: I21a969270e8e7bdd4b15904b7d288fbcbf33e63e