Replace many PgpGeneralExceptions with PgpKeyNotFoundException

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java

@@ -31,6 +31,7 @@ import org.openintents.openpgp.OpenPgpError;
 import org.openintents.openpgp.OpenPgpSignatureResult;
 import org.openintents.openpgp.util.OpenPgpApi;
 import org.spongycastle.util.encoders.Hex;
+import org.sufficientlysecure.keychain.pgp.exception.PgpKeyNotFoundException;
 import org.sufficientlysecure.keychain.ui.NfcActivity;
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.pgp.PassphraseCacheInterface;
@@ -272,9 +273,16 @@ public class OpenPgpService extends RemoteService {
                 InputData inputData = new InputData(is, inputLength);
 
                 // Find the appropriate subkey to sign with
-                CachedPublicKeyRing signingRing =
-                        new ProviderHelper(this).getCachedPublicKeyRing(accSettings.getKeyId());
-                final long sigSubKeyId = signingRing.getSecretSignId();
+                long sigSubKeyId;
+                try {
+                    CachedPublicKeyRing signingRing =
+                            new ProviderHelper(this).getCachedPublicKeyRing(accSettings.getKeyId());
+                    sigSubKeyId = signingRing.getSecretSignId();
+                } catch (PgpKeyNotFoundException e) {
+                    // secret key that is set for this account is deleted?
+                    // show account config again!
+                    return getCreateAccountIntent(data, getAccountName(data));
+                }
 
                 // get passphrase from cache, if key has "no" passphrase, this returns an empty String
                 String passphrase;
@@ -285,8 +293,7 @@ public class OpenPgpService extends RemoteService {
                         passphrase = PassphraseCacheService.getCachedPassphrase(getContext(),
                                 accSettings.getKeyId(), sigSubKeyId);
                     } catch (PassphraseCacheService.KeyNotFoundException e) {
-                        // secret key that is set for this account is deleted?
-                        // show account config again!
+                        // should happen earlier, but return again here if it happens
                         return getCreateAccountIntent(data, getAccountName(data));
                     }
                 }