Description of problem:

 Importing templates through UI causes an error and the page with import results does not load.

How reproducible:

 100%

Is this issue a regression from an earlier version:

 Yes

Steps to Reproduce:

1. Have foreman instance with the templates plugin on nightly (error originates in one of the newest commits so it is not on stream yet).

2. Navigate to Hosts > Templates > Sync Templates

3. Import templates from https://github.com/theforeman/community-templates.git

Actual behavior:

The page with results does not load and two popups are displayed. One saying that templates have been imported succesfully and another saying that there has been an error

Expected behavior:

Page with results loads normally and displays templates correctly

Business Impact / Additional info:

Root of this problem also cause importing templates with hammer fail when using the -v flag.