[ruby-core:74755] [Ruby trunk Bug#12238] Logger writes progname if log message is nil

Issue #12238 has been reported by Konstantin H.

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Bug #12238: Logger writes progname if log message is nil
https://bugs.ruby-lang.org/issues/12238

* Author: Konstantin H
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Please consider the following example:

``` ruby
logger = Logger.new($stdout)

# Log message is nil
logger.info
# I, [2016-03-31T22:04:36.684636 #4019]  INFO -- : nil

logger.progname = 'prog'

# Now log message is changed to progname, is this a bug?
logger.info
# I, [2016-03-31T22:04:51.418510 #4019]  INFO -- prog: prog

logger.info 'test'
# I, [2016-03-31T22:05:03.345434 #4019]  INFO -- prog: test
```

Logger writes progname if log message is nil. Is this a bug or a known feature?



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