[bugfix] add input invoice bugs

atms-api/src/main/java/pwc/taxtech/atms/vat/service/impl/InputInvoiceDataImportServiceImpl.java

@@ -47,7 +47,7 @@ public class InputInvoiceDataImportServiceImpl extends VatAbstractService {
     }
 
     private Page<InputInvoice> get(String code, int period, int page, int size) {
-        PageImpl<InputInvoice> pageInput;
+        PageImpl<InputInvoice> pageInput = null;
         try (CloseableHttpClient httpclient = HttpClients.createDefault();) {
             HttpGet httpget = new HttpGet("http://localhost:8089/input_invoices?page=" + page + "&size=" + size
                     + "&code=" + code + "&period=" + period);
@@ -59,7 +59,7 @@ public class InputInvoiceDataImportServiceImpl extends VatAbstractService {
         } catch (IOException e) {
             e.printStackTrace();
         }
-        return null;
+        return pageInput;
     }