Return custom buttons for service having nil service template

app/models/service.rb

@@ -109,7 +109,11 @@ def custom_actions
   end
 
   def custom_action_buttons
-    service_template&.custom_action_buttons(self)
+    if service_template.nil?
+      CustomButton.where(:applies_to_class => "Service")
+    else
+      service_template.custom_action_buttons(self)
+    end
   end
 
   def power_state

spec/models/service_spec.rb

@@ -826,17 +826,30 @@ def create_deep_tree
     let(:service_template) { FactoryGirl.create(:service_template) }
     let(:service) { FactoryGirl.create(:service, :service_template => service_template) }
 
-    describe "#custom_actions" do
-      it "get list of custom actions from linked service template" do
-        expect(service_template).to receive(:custom_actions)
-        service.custom_actions
+    context "with template" do
+      describe "#custom_actions" do
+        it "get list of custom actions from linked service template" do
+          expect(service_template).to receive(:custom_actions)
+          service.custom_actions
+        end
+      end
+
+      describe "#custom_action_buttons" do
+        it "get list of custom action buttons from linked service template" do
+          expect(service_template).to receive(:custom_action_buttons)
+          service.custom_action_buttons
+        end
       end
     end
 
-    describe "#custom_action_buttons" do
-      it "get list of custom action buttons from linked service template" do
-        expect(service_template).to receive(:custom_action_buttons)
-        service.custom_action_buttons
+    context "without valid template" do
+      let!(:custom_button) { FactoryGirl.create(:custom_button, :applies_to_class => "Service") }
+      let(:service) { FactoryGirl.create(:service, :service_template_id => -1) }
+
+      describe "#custom_action_buttons" do
+        it "get list of custom action buttons on services" do
+          expect(service.custom_action_buttons).to include(custom_button)
+        end
       end
     end
   end