Merge pull request #1855 from AlexFJW/ImportKeyFix

Fixes bug for #1854

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/ImportKeysListLoader.java

@@ -141,6 +141,7 @@ public class ImportKeysListLoader
             OperationResult.OperationLog log = new OperationResult.OperationLog();
             log.add(OperationResult.LogType.MSG_GET_NO_VALID_KEYS, 0);
             GetKeyResult getKeyResult = new GetKeyResult(GetKeyResult.RESULT_ERROR_NO_VALID_KEYS, log);
+            mData.clear();
             mEntryListWrapper = new AsyncTaskResultWrapper<>(mData, getKeyResult);
         }
     }