Migration.rb: deal with $stdin being Nil (happend for some reason in …

[stonemaster]

…production)

[astier]

This happens to me if I run svn2git --rebase as a cronjob:

* * * * * svn2git --rebase > ~/cron_log 2>&1

The error in ~/cron_log is then:

#<Thread:0x000055f5267eaa10 /usr/lib/ruby/gems/2.7.0/gems/svn2git-2.4.0/lib/svn2git/migration.rb:404 run> terminated with exception (report_on_exception is true):
/usr/lib/ruby/gems/2.7.0/gems/svn2git-2.4.0/lib/svn2git/migration.rb:405:in `block (2 levels) in run_command': undefined method `chomp' for nil:NilClass (NoMethodError)
	from /usr/lib/ruby/gems/2.7.0/gems/svn2git-2.4.0/lib/svn2git/migration.rb:405:in `loop'
	from /usr/lib/ruby/gems/2.7.0/gems/svn2git-2.4.0/lib/svn2git/migration.rb:405:in `block in run_command'