WT 1.1.11+5 bug fixes customer change

lib/repository/customer_repository.dart

@@ -101,27 +101,27 @@ class CustomerRepository with Logging {
   }
 
   setName(String name) {
-    if (this.customer == null) return;
+    if (this.customer == null) throw Exception("Initialize the customer object");
     this.customer!.name = name;
   }
 
   setFirstName(String firstName) {
-    if (this.customer == null) return;
+    if (this.customer == null) throw Exception("Initialize the customer object");
     this.customer!.firstname = firstName;
   }
 
   setPassword(String password) {
-    if (this.customer == null) return;
+    if (this.customer == null) throw Exception("Initialize the customer object");
     this.customer!.password = password;
   }
 
   setEmail(String email) {
-    if (this.customer == null) return;
+    if (this.customer == null) throw Exception("Initialize the customer object");
     this.customer!.email = email;
   }
 
   setSex(String sex) {
-    if (this.customer == null) return;
+    if (this.customer == null) throw Exception("Initialize the customer object");
     this.customer!.sex = sex;
   }