improve deleted server handling

amnet-native/app/ServerCardIn.tsx

@@ -29,12 +29,12 @@ export default function ServerCardIn({route, navigation}) {
         switch (selectedCard?.isValid()) {
             case true:
                 return cards.filter(x => !x._id.equals(selectedCard._id));
-                
-                // clear out invalid 
+
+            // clear out invalid 
             case false:
                 setSelectedCard(null);
                 return cards;
-                
+
             default:
                 return cards;
         }
@@ -65,10 +65,14 @@ export default function ServerCardIn({route, navigation}) {
 
     // refresh server info (server change or reload request)
     useEffect(() => {
-        if (!server) {
+        if (server?.isValid() !== true) {
             navigation.goBack();
 
-            Alert.alert("Server not found", "The server you are looking for does not exist.");
+            // don't show error on invalid server, just means it was deleted
+            if (!server) {
+                Alert.alert("Server not found", "The server you are looking for does not exist.");
+            }
+            
             return;
         }