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NumberFormatException occurred when use `MySQL.NORMAL_REPLICATION`

See original GitHub issue

Master branch https://github.com/apache/shardingsphere/commit/b01c9b3bf5bd44e651649b1e1535884bb6f395f9

Use db-discovery feature - MySQL.NORMAL_REPLICATION

Not set delay-milliseconds-threshold in configuration

Exception in thread "main" java.lang.NumberFormatException: null
	at java.base/java.lang.Long.parseLong(Long.java:655)
	at java.base/java.lang.Long.parseLong(Long.java:817)
	at org.apache.shardingsphere.dbdiscovery.mysql.type.MySQLNormalReplicationDatabaseDiscoveryProviderAlgorithm.loadReplicaStatus(MySQLNormalReplicationDatabaseDiscoveryProviderAlgorithm.java:126)
	at org.apache.shardingsphere.dbdiscovery.algorithm.DatabaseDiscoveryEngine.loadReplicaStatus(DatabaseDiscoveryEngine.java:128)
	at org.apache.shardingsphere.dbdiscovery.algorithm.DatabaseDiscoveryEngine.postReplicaDataSourceDisabledEvent(DatabaseDiscoveryEngine.java:107)
	at org.apache.shardingsphere.dbdiscovery.algorithm.DatabaseDiscoveryEngine.changePrimaryDataSource(DatabaseDiscoveryEngine.java:77)
	at org.apache.shardingsphere.dbdiscovery.rule.DatabaseDiscoveryRule.findPrimaryReplicaRelationship(DatabaseDiscoveryRule.java:122)
	at org.apache.shardingsphere.dbdiscovery.rule.DatabaseDiscoveryRule.<init>(DatabaseDiscoveryRule.java:82)
	at org.apache.shardingsphere.dbdiscovery.rule.builder.DatabaseDiscoveryRuleBuilder.build(DatabaseDiscoveryRuleBuilder.java:47)
	at org.apache.shardingsphere.dbdiscovery.rule.builder.DatabaseDiscoveryRuleBuilder.build(DatabaseDiscoveryRuleBuilder.java:36)
	at org.apache.shardingsphere.infra.rule.builder.database.DatabaseRulesBuilder.build(DatabaseRulesBuilder.java:56)
	at org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase.create(ShardingSphereDatabase.java:75)
	at org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabasesFactory.createGenericDatabases(ShardingSphereDatabasesFactory.java:79)
	at org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabasesFactory.create(ShardingSphereDatabasesFactory.java:67)
	at org.apache.shardingsphere.mode.manager.cluster.ClusterContextManagerBuilder.buildMetaDataContexts(ClusterContextManagerBuilder.java:90)
	at org.apache.shardingsphere.mode.manager.cluster.ClusterContextManagerBuilder.build(ClusterContextManagerBuilder.java:69)
	at org.apache.shardingsphere.proxy.initializer.BootstrapInitializer.createContextManager(BootstrapInitializer.java:66)
	at org.apache.shardingsphere.proxy.initializer.BootstrapInitializer.init(BootstrapInitializer.java:55)
	at org.apache.shardingsphere.proxy.Bootstrap.main(Bootstrap.java:50)