crated an exeption

src/main/java/mops/gruppen2/domain/exception/NoAdminAfterActionExeption.java

@@ -0,0 +1,10 @@
+package mops.gruppen2.domain.exception;
+
+import org.springframework.http.HttpStatus;
+
+public class NoAdminAfterActionExeption extends EventException {
+
+    public NoAdminAfterActionExeption (String info) {
+        super(HttpStatus.INTERNAL_SERVER_ERROR, "Nach dieser Aktion hätte die Gruppe keinen Admin mehr", info);
+    }
+}