Log level in subsection is not honored

[Elbandi]

• Gitea version (or commit ref): 1.13.6 (release)
• Git version: 2.17.1
• Operating system: Ubuntu bionic LTS
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No : no api issue
• Log gist:
  no

Description

If there is an empty LEVEL parameter in log.* section, the main log level is not honored.
This is the app.ini setttings:

[log]
ROOT_PATH =
; Either "console", "file", "conn", "smtp" or "database", default is "console"
; Use comma to separate multiple modes, e.g. "console, file"
MODE = console
; Either "Trace", "Debug", "Info", "Warn", "Error", "Critical", default is "Trace"
LEVEL = Trace

[log.console]
LEVEL =
STDERR = false

In this case only >INFO logs are displayed. because missing value is use the default info level. if no LEVEL in log.console, trace is active.

If this is a normal behavior, it sould be documented. and in the example config all sub log section have LEVEL, so the [log] LEVEL settings are ignored.