Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1482137

Description of problem:
While updating the subnet parameter with some invalid name(name containing spaces) doesn't show an error 'Name can't contain spaces' or equivalent error

Version-Release number of selected component (if applicable):
Satellite 6.3.0 Snap 11

How reproducible:
Always

Steps to Reproduce:
1. Create Subnet
2. Add parameter with valid name and valid value
3. From Web UI, Open above subnet and attempt to update the parameter with an invalid name(I tried with a name containing space).

Actual results:
Satellite web doesn't throw error for an invalid name(in my case 'Name can't contain spaces')

Expected results:
Satellite web should throw an error for updating subnet parameter with an invalid name.

Additional info:
Production logs throwing a correct error as below but not UI:
[I] Current user: admin (administrator)
2017-08-16 10:10:03 0bea6436 [app] [I] Failed to save: Name can't contain spaces.
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered subnets/_fields.html.erb (8.7ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered common_parameters/_parameter.html.erb (1.9ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered common_parameters/_parameter.html.erb (1.7ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered common_parameters/_parameter.html.erb (1.7ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered common_parameters/_parameter.html.erb (1.7ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered common_parameters/_parameter.html.erb (1.7ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered common_parameters/_parameter.html.erb (1.7ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered common_parameters/_parameters.html.erb (20.8ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered taxonomies/_loc_org_tabs.html.erb (23.7ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered subnets/_form.html.erb (91.5ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Rendered subnets/edit.html.erb (92.0ms)
2017-08-16 10:10:03 0bea6436 [app] [I] Completed 200 OK in 148ms (Views: 84.9ms | ActiveRecord: 15.6ms)