formating; explicitly return nil from text_to_color on failure. The latter is...

formating; explicitly return nil from text_to_color on failure. The latter is needed because a warning will be added to 2.0.1 about missing returns (not yet in trunk)

data/magic.mse-game/script

@@ -135,7 +135,7 @@ text_to_color := {
 				else mana_to_color(hybrid: "")
 			)
 		)
-	)
+	) else nil
 }
 
 # The color of a card
@@ -148,7 +148,7 @@ is_spell       := match@(match: "(?i)Instant|Sorcery")
 card_color := {
 	# usually the color of mana
 	text_color := text_to_color(rules_text, land: is_land(type));
-	if text_color == "" then (
+	if text_color == nil then (
 		mana_color := mana_to_color(colors: color_filter(casting_cost), hybrid: color_filterH(casting_cost))
 		if      mana_color == "colorless" and is_land    (type)  then land_to_color(watermark)
 		else if mana_color == "colorless" and is_artifact(type)  then "artifact"