use Julian's isStackCoin helper func

very nice.  didn't realize I could catch an error.  learning every day round here

lib/pages/buy_view/sub_widgets/crypto_selection_view.dart

@@ -250,13 +250,23 @@ class _CryptoSelectionViewState extends State<CryptoSelectionView> {
   }
 }
 
+bool isStackCoin(String? ticker) {
+  if (ticker == null) return false;
+
+  try {
+    coinFromTickerCaseInsensitive(ticker);
+    return true;
+  } on ArgumentError catch (_) {
+    return false;
+  }
+}
+
 Widget? getIconForTicker(String ticker) {
   print(ticker);
-  String? iconAsset = isCoinSupportedByTicker(ticker)
+  String? iconAsset = isStackCoin(ticker)
       ? Assets.svg.iconFor(coin: coinFromTickerCaseInsensitive(ticker))
       : Assets.svg.buyIconFor(ticker);
-  if (iconAsset != null) {
+  return (iconAsset != null)
-    return SvgPicture.asset(iconAsset, height: 20, width: 20);
+      ? SvgPicture.asset(iconAsset, height: 20, width: 20)
-  }
+      : null;
-  return null;
 }

lib/utilities/enums/coin_enum.dart

@@ -328,29 +328,3 @@ Coin coinFromTickerCaseInsensitive(String ticker) {
           ticker, "name", "No Coin enum value with that ticker");
   }
 }
-
-// This was added for the Buy view.I would use coinFromTickerCaseInsensitive
-// however I need it to return null or something else to indicate failure
-// instead of throwing an exception
-bool isCoinSupportedByTicker(String ticker) {
-  switch (ticker.toLowerCase()) {
-    case "btc":
-    case "ltc":
-    case "bch":
-    case "doge":
-    case "epic":
-    case "firo":
-    case "xmr":
-    case "nmc":
-    case "part":
-    case "tltc":
-    case "tbtc":
-    case "tbch":
-    case "tfiro":
-    case "tdoge":
-    case "wow":
-      return true;
-    default:
-      return false;
-  }
-}