padrino/padrino-framework — pull request #1213 by tmtm (2013-04-01 15:21:11+00:00)
Title: fix flash_tag() with multiple attributes.

flash_tag() with multiple attributes raises NoMethodError when some attributes are not given.

When flash is set in controller:

flash[:error] = 'error message'
flash[:success] = 'success message'

and use flash_tag() in view:

flash_tag(:error, :warning, :success)

Then raise error:

NoMethodError: undefined method `<<' for nil:NilClass