Show message and not let user proceed when tapped on a token with balance 0 in the wallet tab

AlphaWallet/InCoordinator.swift

@@ -340,6 +340,11 @@ class InCoordinator: Coordinator {
             return
         }
 
+        guard !token.nonZeroBalance.isEmpty else {
+            navigationController.displayError(error: NoTokenError())
+            return
+        }
+
         let session = transactionCoordinator.session
         let tokenStorage = transactionCoordinator.tokensStorage
 
@@ -632,3 +637,9 @@ extension InCoordinator: PromptBackupCoordinatorDelegate {
         removeCoordinator(coordinator)
     }
 }
+
+struct NoTokenError: LocalizedError {
+    var errorDescription: String? {
+        return R.string.localizable.aWalletNoTokens()
+    }
+}

AlphaWallet/Localization/en.lproj/Localizable.strings

@@ -205,6 +205,7 @@
 "a.wallet.contents.filter.assetsOnly.title" = "ASSETS";
 "a.wallet.contents.issuer.title" = "Issuer";
 "a.wallet.next.button.title" = "Next";
+"a.wallet.no.tokens" = "You don't have any tokens";
 "a.help.navigation.title" = "Help & FAQs";
 "a.help.contact.footer.button.title" = "Still need help? Contact Us";
 "a.help.contact.email.subject" = "Help/Feedback for AlphaWallet";

AlphaWallet/Localization/es.lproj/Localizable.strings

@@ -205,6 +205,7 @@
 "a.wallet.contents.filter.assetsOnly.title" = "ASSETS";
 "a.wallet.contents.issuer.title" = "Issuer";
 "a.wallet.next.button.title" = "Next";
+"a.wallet.no.tokens" = "You don't have any tokens";
 "a.help.navigation.title" = "Help & FAQs";
 "a.help.contact.footer.button.title" = "Still need help? Contact Us";
 "a.help.contact.email.subject" = "Help/Feedback for AlphaWallet";

AlphaWallet/Localization/zh-Hans.lproj/Localizable.strings

@@ -205,6 +205,7 @@
 "a.wallet.contents.filter.assetsOnly.title" = "资产类";
 "a.wallet.contents.issuer.title" = "发行方";
 "a.wallet.next.button.title" = "下一步";
+"a.wallet.no.tokens" = "You don't have any tokens";
 "a.help.navigation.title" = "帮助";
 "a.help.contact.footer.button.title" = "需要进一步帮助? 联系我们";
 "a.help.contact.email.subject" = "帮助/建议";