fix type error

Author: wubin1

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

@@ -925,7 +925,6 @@ public void setResult(Runtime runtime) {
       return;
     }
     this.setResultCode(contractResult.UNKNOWN);
-    return;
   }
 
   public void setResultCode(contractResult code) {

src/main/java/org/tron/core/config/args/Args.java

@@ -135,11 +135,11 @@ public class Args {
   private String storageDbEngine = "";
 
   @Parameter(names = {
-      "--storage-db-synchronous"}, description = "Storage db is synchronous or not.(true or flase)")
+      "--storage-db-synchronous"}, description = "Storage db is synchronous or not.(true or false)")
   private String storageDbSynchronous = "";
 
   @Parameter(names = {
-      "--contract-parse-enable"}, description = "enable contract parses in java-tron or not.(true or flase)")
+      "--contract-parse-enable"}, description = "enable contract parses in java-tron or not.(true or false)")
   private String contractParseEnable = "";
 
   @Parameter(names = {"--storage-index-directory"}, description = "Storage index directory")

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

@@ -39,10 +39,15 @@ public TransactionInfoCapsule getTransactionInfo(byte[] key) throws BadItemExcep
       return null;
     }
     byte[] value = revokingDB.getUnchecked(ByteArray.fromLong(blockNumber));
+    if (Objects.isNull(value)) {
+      return null;
+    }
+
     TransactionRetCapsule result = new TransactionRetCapsule(value);
     if (Objects.isNull(result) || Objects.isNull(result.getInstance())) {
       return null;
     }
+
     for (TransactionInfo transactionResultInfo : result.getInstance().getTransactioninfoList()) {
       if (transactionResultInfo.getId().equals(ByteString.copyFrom(key))) {
         return new TransactionInfoCapsule(transactionResultInfo);