Created attachment 1407983 [details]
API Error: 400 Bad Request

Description of problem:
This is exceptional use-case where you attach automate and dialog both feature to custom button. This is giving `400 Bad Request` API error which is blocking dialog to appear. 

Version-Release number of selected component (if applicable):
5.9.0.22.20180221205805_f93a675 

How reproducible:
Always

Steps to Reproduce:
1. Create dialog
2. Create instance and associative method 
Use simple ruby code behind method, for example: $evm.log("info", "CUSTOM_BUTTON_EXECUTED")
3. Create custom button for provider object type
4. Attach dialog (step1) and method (step2) to custom button
5. Goto Compute > Infra > Provider > Your provider detail page 
6. Execute custom button

When you select `Provider` object type with mentioned settings you will get custom button on following display pages:
a. Summery view of Infra provider page (*400 Bad Request*)
b. Dashboard view of Indra provider page (*400 Bad Request*)
c. Summery view of Cloud provider page (working)
d. Summery view of Containers provider page (working)
e. Dashboard view of Containers provider page (working)
f. Summery view of Containers provider page (working)
g. Dashboard view of Containers provider page (working)

Here a and b are vulnerable cases, however, custom button works well without dialog.  


Actual results:
Blocking dialog to appear on infra provider object type


Expected results:
Dialog should work on infra provider