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[#20425] Provide a better error message if user creates the hand with an incorrect card string

Date:
2008-05-28 22:43		 Priority:
2
Submitted By:
Robert Olson (aleran) 		Assigned To:
Robert Olson (aleran)
Category:
None		 State:
Open
Summary:
Provide a better error message if user creates the hand with an incorrect card string

Detailed description 
A common mistake is for users to try and create a 10 card using '10' instead of 'T'. Add a nice error message if they
make this, or a similar, mistake.

athena ~ $ irb -r ruby-poker
>> PokerHand.new("10h")
NoMethodError: undefined method `-' for nil:NilClass
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/card.rb:33:in `face_value'
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/card.rb:52:in `build_from_face_suit'
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/card.rb:42:in `build_from_string'
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/card.rb:75:in `initialize'
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/ruby-poker.rb:26:in `new'
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/ruby-poker.rb:26:in `initialize'
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/ruby-poker.rb:26:in `map'
	from /Library/Ruby/Gems/1.8/gems/ruby-poker-0.3.0/lib/ruby-poker.rb:26:in `initialize'
	from (irb):1:in `new'
	from (irb):1

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