Error when formatting invalid numbers

[espen]

"+479090909".phony_formatted(:normalize => :NO, :format => :international)
NoMethodError: undefined method split' for 1:Fixnum from /phony-2.0.1/lib/phony/country_codes.rb:70:insplit'

+479090909 is missing a digit and is thus invalid. From Phony:

Phony.plausible?('+479090909', cc: '47')
=> false

[joost]

What would you return on invalid phone strings? An empty string? nil?

[espen]

Well since this is a wrapper lib and the function is for formatting I think it should return nil.