fix: remove NoKeysProvided error

We're making this invariant impossible in the code paths that hit it

crypto-common/src/main/kotlin/app/passwordstore/crypto/errors/CryptoException.kt

@@ -37,8 +37,5 @@ public sealed class CryptoHandlerException(message: String? = null, cause: Throw
 /** The passphrase provided for decryption was incorrect. */
 public class IncorrectPassphraseException(cause: Throwable) : CryptoHandlerException(null, cause)
 
-/** No keys were provided for encryption. */
-public class NoKeysProvided(message: String?) : CryptoHandlerException(message, null)
-
 /** An unexpected error that cannot be mapped to a known type. */
 public class UnknownError(cause: Throwable) : CryptoHandlerException(null, cause)

crypto-pgpainless/src/main/kotlin/app/passwordstore/crypto/PGPainlessCryptoHandler.kt

@@ -7,7 +7,6 @@ package app.passwordstore.crypto
 
 import app.passwordstore.crypto.errors.CryptoHandlerException
 import app.passwordstore.crypto.errors.IncorrectPassphraseException
-import app.passwordstore.crypto.errors.NoKeysProvided
 import app.passwordstore.crypto.errors.UnknownError
 import com.github.michaelbull.result.Result
 import com.github.michaelbull.result.mapError
@@ -38,7 +37,7 @@ public class PGPainlessCryptoHandler @Inject constructor() :
     options: PGPDecryptOptions,
   ): Result<Unit, CryptoHandlerException> =
     runCatching {
-        if (keys.isEmpty()) throw NoKeysProvided("No keys provided for encryption")
+        require(keys.isNotEmpty())
         val keyringCollection =
           keys
             .map { key -> PGPainless.readKeyRing().secretKeyRing(key.contents) }
@@ -68,7 +67,7 @@ public class PGPainlessCryptoHandler @Inject constructor() :
     options: PGPEncryptOptions,
   ): Result<Unit, CryptoHandlerException> =
     runCatching {
-        if (keys.isEmpty()) throw NoKeysProvided("No keys provided for encryption")
+        require(keys.isNotEmpty())
         val publicKeyRings =
           keys.mapNotNull(KeyUtils::tryParseKeyring).mapNotNull { keyRing ->
             when (keyRing) {