add more unit test for transactionRet

Author: wubin1

src/main/java/org/tron/core/capsule/TransactionRetCapsule.java

@@ -40,6 +40,9 @@ public void addTransactionInfo(TransactionInfo result) {
 
   @Override
   public byte[] getData() {
+    if (Objects.isNull(transactionRet)) {
+      return null;
+    }
     return transactionRet.toByteArray();
   }
 

src/main/java/org/tron/core/db/Manager.java

@@ -1389,7 +1389,10 @@ public synchronized BlockCapsule generateBlock(
         tmpSeesion.merge();
         // push into block
         blockCapsule.addTransaction(trx);
-        transationRetCapsule.addTransactionInfo(result);
+
+        if (Objects.nonNull(result)) {
+          transationRetCapsule.addTransactionInfo(result);
+        }
         if (fromPending) {
           iterator.remove();
         }

src/test/java/org/tron/core/db/TransactionRetStoreTest.java

@@ -73,4 +73,19 @@ public void get() throws BadItemException {
     TransactionInfoCapsule resultCapsule = transactionRetStore.getTransactionInfo(transactionId);
     Assert.assertNotNull("get transaction ret store", resultCapsule);
   }
+
+  @Test
+  public void put() {
+    TransactionInfoCapsule transactionInfoCapsule = new TransactionInfoCapsule();
+    transactionInfoCapsule.setId(transactionId);
+    transactionInfoCapsule.setFee(1000L);
+    transactionInfoCapsule.setBlockNumber(100L);
+    transactionInfoCapsule.setBlockTimeStamp(200L);
+
+    TransactionRetCapsule transactionRetCapsule = new TransactionRetCapsule();
+    transactionRetCapsule.addTransactionInfo(transactionInfoCapsule.getInstance());
+    Assert.assertNull("put transaction info error", transactionRetStore.getUnchecked(transactionInfoCapsule.getId()));
+    transactionRetStore.put(transactionInfoCapsule.getId(), transactionRetCapsule);
+    Assert.assertNotNull("get transaction info error", transactionRetStore.getUnchecked(transactionInfoCapsule.getId()));
+  }
 }