Error creating Marketplace in SSO mode (with tenant id)

[ghost]

[Version] ESCM 17.4 SAML mode [Build] BES_MASTER_UNIT-2087 2017/09/08

[Steps to reproduce]

1. log in as platform administrator
2. go to create marketplace
3. enter marketplace name, marketplaceid
4. click on symbol beside owner organization ID, pick org id
5. click on symbol beside tenant ID, and realize that default cannot be chosen (documentation states, if default tenant is to used, leave empty, so close list and do not enter tenantid)
6. click save

[Expected result] marketplace is created with id

[Observed result] error message "The tenant does not exist."

[Details] even though the tenant is left empty, the error message occurs. After checking this in more detail, I noticed that if I do not do step 5 (click on the list of tenants), I do not have a problem. So this is a workaround, but not very pretty, since you will click on the symbol even to find the default tenant. Maybe this should be fixed as with issue #457