Before calling the module specified by ledger, determine whether it i…

…s initialized (FISCO-BCOS#1485)

Merge pull request FISCO-BCOS#1284 from chaychen2005/release-2.2.0-final

sync 2.2.0 to master

fix the bug that tx_count_limit has decreased while the adjusted maxT…

…ransactions in a block can seal doesn't decrease (FISCO-BCOS#1042)

update ChangeLog.md (FISCO-BCOS#1000)

fix select null, because columnValue

fix compile demo failed

Merge pull request FISCO-BCOS#662 from FISCO-BCOS/release-1.3.8

Release 1.3.8

Merge pull request FISCO-BCOS#486 from FISCO-BCOS/release-1.3.7

Release 1.3.7