optional support for blank dividers with extra text. Some minor fixes and pep8.

card_db/en_us/dominion_cards.txt

@@ -336,7 +336,7 @@ ______________________
 When you gain this, look through your discard pile (including this), reveal any number of Action cards from it, and shuffle them into your deck.
 22	Mandarin	Hinterlands	Action	$5	+3 Coins
 Put a card from your hand on top of your deck.
-----------------------
+----------
 When you gain this, put all Treasures you have in play on top of your deck in any order.
 23	Margrave	Hinterlands	Action - Attack	$5	+3 Cards
 +1 Buy
@@ -344,7 +344,7 @@ Each other player draws a card, then discards down to 3 cards in hand.
 24	Stables	Hinterlands	Action	$5	You may discard a Treasure. If you do, +3 Cards and +1 Action.
 25	Border Village	Hinterlands	Action	$6	+1 Card
 +2 Actions
-----------------------
+----------
 When you gain this, gain a card costing less than this.
 26	Farmland	Hinterlands	Victory	$6	2 <VP>
 ----------
@@ -446,7 +446,7 @@ ______________________
 When one of your cards is trashed,
 you may discard this from your
 hand. If you do, gain a Gold.
-34	Rebuild	Dark Ages	Action	$5	+ 1Action
+34	Rebuild	Dark Ages	Action	$5	+ 1 Action
 Name a card. Reveal cards from the top of your deck until you reveal a Victory card that is not the named card. Discard the other cards. Trash the Victory card and gain a Victory card costing up to 3 Coins more than it.
 35	Rogue	Dark Ages	Action - Attack	$5	+ 2 Coins
 If there are any cards in the trash costing from 3 Coins to 6 Coins, gain one of them. Otherwise, each other player reveals the top 2 cards of his deck, trashes one of them costing from 3 Coins to 6 Coins, and discards the rest.

card_db/en_us/mapping.yaml

@@ -9,3 +9,4 @@
 "Ruins": "Ruins"
 "Looter": "Looter"
 "Curse": "Curse"
+"Blank": "Blank"