Enhanced validation of DEFAULT_NODE environment variable
Description
Config file's 'default_node' property doesn't work at current version.
Although no env var DEFAULT_NODE set, config loader is trying to set empty string as default_node after loading config file.
As a result, config file's default_node is ignored.
So added validation of env var DEFAULT_NODE variable.
Enhanced validation of DEFAULT_NODE environment variable
Description
Config file's 'default_node' property doesn't work at current version. Although no env var
DEFAULT_NODE
set, config loader is trying to set empty string asdefault_node
after loading config file. As a result, config file'sdefault_node
is ignored.So added validation of env var
DEFAULT_NODE
variable.Related issue: https://github.com/qiuxiafei/zk-web/issues/39