Docummentation + unused exception removal

sdk-lib/src/main/java/cash/z/ecc/android/sdk/exception/Exceptions.kt

@@ -53,13 +53,6 @@ sealed class CompactBlockProcessorException(message: String, cause: Throwable? =
 
     class FailedReorgRepair(message: String) : CompactBlockProcessorException(message)
 
-    class Uninitialized(cause: Throwable? = null) : CompactBlockProcessorException(
-        "Cannot process blocks because the wallet has not been" +
-            " initialized. Verify that the seed phrase was properly created or imported. If so, then this problem" +
-            " can be fixed by re-importing the wallet.",
-        cause
-    )
-
     data object NoAccount : CompactBlockProcessorException(
         "Attempting to scan without an account. This is probably a setup error or a race condition."
     ) {

sdk-lib/src/main/java/cash/z/ecc/android/sdk/internal/TypesafeBackendImpl.kt

@@ -154,7 +154,7 @@ internal class TypesafeBackendImpl(private val backend: Backend) : TypesafeBacke
         val ret = backend.initDataDb(seed)
         when (ret) {
             1 -> throw InitializeException.SeedRequired
-            0 -> {}
+            0 -> { /* Successful case - no action needed */ }
             -1 -> error("Rust backend only uses -1 as an error sentinel")
             else -> error("Rust backend used a code that needs to be defined here")
         }