feat(net): optimize validSignature function

Author: xxo1shine

framework/src/main/java/org/tron/core/net/TronNetDelegate.java

@@ -315,14 +315,16 @@ public void pushTransaction(TransactionCapsule trx) throws P2pException {
   }
 
   public void validSignature(BlockCapsule block) throws P2pException {
+    boolean flag;
     try {
-      if (!block.validateSignature(dbManager.getDynamicPropertiesStore(),
-              dbManager.getAccountStore())) {
-        throw new P2pException(TypeEnum.BLOCK_SIGN_ERROR, "valid signature failed.");
-      }
-    } catch (ValidateSignatureException e) {
+      flag = block.validateSignature(dbManager.getDynamicPropertiesStore(),
+              dbManager.getAccountStore());
+    } catch (Exception e) {
       throw new P2pException(TypeEnum.BLOCK_SIGN_ERROR, e);
     }
+    if (!flag) {
+      throw new P2pException(TypeEnum.BLOCK_SIGN_ERROR, "valid signature failed.");
+    }
   }
 
   public boolean validBlock(BlockCapsule block) throws P2pException {