Description of problem:

Checking Ansible variables on a host hit:

TypeError: string.split is not a function
    in O
    in a
    in f
    in div
    in s
    in t
    in t
    in f
    in l
    in d
    in s
    in d
    in C
    in t
    in t
    in t
    in t
    in d
    in section
    in PageSection
    in M
    in t
    in t
    in u
    in f
    in d
    in div
    in c
    in p
    in y
    in t
    in n
    in a
    in C
    in s
    in div
    in b
    in IntlProvider
    in I18nProviderWrapper(b)
    in d
    in StoreProvider(I18nProviderWrapper(b))
    in DataProvider(StoreProvider(I18nProviderWrapper(b)))

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

6.12

How reproducible:

Easy


Steps to Reproduce:
1. create a new Ansible variable with array type. Default value is ["test"]
2. enable both 'Merge Overrides' and 'Merge Default' 
3. add the variable to a role
4. attach the role to a host
5. check the ansible variables on the host
Actual results:

TypeError: string.split is not a function,    in O    in a    in f    in div    in s    in t    in t    in f    in l    in d    in

Expected results:

should no error

Additional info:

the error only happens when both 'Merge Overrides' and 'Merge Default' are on