Description: The following problems exist in Reports > Availability report, when 'By trigger template' mode is used:

1) Filters applied without clicking on 'Apply' button after selecting values in 'Template' , 'Template trigger', 'Host group' fields.

Steps to reproduce:

1. Go to Reports > Availability report

2. Select Mode - 'By trigger template'

3. Select value in 'Host group' field (or in Template or in Template trigger)

Result:
Results are filtered without clicking on 'Apply' button.

Expected:
Results are filtered only after clicking on 'Apply' button.

2) Filtering is not applied by 'Template group' if a parent group is selected.

Steps to reproduce:

1. Go to Reports > Availability report

2. Select Mode - 'By trigger template'

3. Select 'Templates' in 'Template group' field

4. Click on 'Apply' button

Result:
No data found.

Expected:
All triggers from child host groups that exists on some hosts should be returned.