Problem description: It is possible to create a service that has " " (without quotes) as name. In this case the name of the service becomes empty. Such behavior is not consistent in respect to other forms, for example for Host configuration form, where an error is throw in this case.

Steps to reproduce:

1. Navigate to Monitoring => Services and enter Edit mode.
2. Create a service with " " in field name (without quotes)

Result: Service is successfully created. Service has empty name in Name column in the list of services.
Expected: it should not be possible to create services with such names