Error messages

[YujithIsura]

In the current system create election template module doesn't show any error message to the user in the event of unsuccessful form submission

To Reproduce
Steps to reproduce the behavior:

1. Click on create election tab on side navigation bar
2. Give election name eg: Presidential 2019
3. Click on next button
4. Go to final step of the wizard
5. Click on submit for approval button
6. You can see the snack bar for success message

Expected behavior
even though we have success message. currently there in no message showing in the event of unsuccessful form submission so we need to show informative error messages in the event of unsuccessful form submission as well

Additional context
we will have to do the same changes for the update election template as well