1. Go to any input form (e.g. add new tax).
2. Click on save without putting in any values

Expected Behavior

An input validation should be shown to the user.

Current Behavior

The application tries to save the values and is running into an error after some time.

Screenshots

Steps to Reproduce

1. Go to any input form (e.g. add new tax).
2. Click on save without putting in any values

Detailed Description

This happens on any form

• custom_fields form
• email_template form
• invoice_groups/form
• etc.