状态机在walk验证区块执行timer合约时检查autoTx.TxOutputsExt为空时返回错误，导致停止出块

[wangchao0222]

Description

状态机在walk验证区块执行timer合约时检查autoTx.TxOutputsExt为空时返回错误，导致停止出块

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Brief of your solution

区块验证时不检查timer_task合约执行的读写集输出

How Has This Been Tested?

节点验证区块timer合约结果集输出为空时，仍可继续出块

[codecov-commenter]

Codecov Report

Merging #308 (667d848) into master (c0696d1) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #308   +/-   ##
=======================================
  Coverage   46.42%   46.42%           
=======================================
  Files         136      136           
  Lines       12199    12197    -2     
=======================================
  Hits         5663     5663           
  Misses       5360     5360           
+ Partials     1176     1174    -2     

Impacted Files	Coverage Δ
bcs/ledger/xledger/state/tx_verification.go	14.49% <ø> (+0.05%)	:arrow_up:
bcs/network/p2pv1/conn.go	55.10% <0.00%> (-6.13%)	:arrow_down:
bcs/network/p2pv2/server.go	51.33% <0.00%> (-1.07%)	:arrow_down:
kernel/consensus/base/driver/chained-bft/smr.go	40.45% <0.00%> (+0.75%)	:arrow_up:
bcs/consensus/xpoa/xpoa.go	54.40% <0.00%> (+1.03%)	:arrow_up:
bcs/contract/xvm/code_manager.go	66.36% <0.00%> (+2.72%)	:arrow_up:

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