Support non-numeric collector numbers with no digits

As recently noticed from #11145.

According to the Scryfall team, _"card numbers should be considered to be plaintext strings. they may contain multiple non-digit components, may contain no digits at all, and may not correspond to anything at all seen on the card"_.

Currently we have code that assumes card number contains digits that can be parsed to an integer. Specifically, `MageCardComparator` fails to sort as `Integer.parseInt()` throws a `NumberFormatException` which isn't handled, and this breaks the deck editor view.

Need to check for any other code that might need adjustment, perhaps `CardUtil.parseCardNumberAsInt()`, not sure if there are others.