only import from tenant_schemas if it's present in INSTALLED_APPS (#5064)

hobo/forms.py

@@ -1,8 +1,9 @@
 from django.forms import ModelForm
+from django.conf import settings
 
-try:
+if 'tenant_schemas' in settings.INSTALLED_APPS:
     from tenant_schemas.utils import get_tenant_model
-except ImportError:
+else:
     get_tenant_model = lambda: None
 
 class HoboForm(ModelForm):

hobo/views.py

@@ -7,13 +7,8 @@ from django.views.generic import edit
 from django.core.urlresolvers import reverse
 
 from .environment.utils import Zone, get_operational_services
-from .forms import HoboForm, HoboUpdateForm
+from .forms import HoboForm, HoboUpdateForm, get_tenant_model
 
-try:
-    from tenant_schemas.utils import get_tenant_model, get_public_schema_name
-except ImportError:
-    get_tenant_model = lambda: None
-    get_public_schema_name = lambda: ''
 
 class Home(TemplateView):
     template_name = 'hobo/home.html'
@@ -38,7 +33,7 @@ class ManagerHome(edit.CreateView):
         return reverse('manager-home')
 
     def get_context_data(self, **kwargs):
-        from tenant_schemas.utils import get_tenant_model
+        from tenant_schemas.utils import get_public_schema_name
         context = super(ManagerHome, self).get_context_data(**kwargs)
         tenants_list = ()
         for obj in get_tenant_model().objects.exclude(schema_name=get_public_schema_name()):