display service name in feedback email if user is logged in

also, split out a couple of tests for legibility and clear up some
linter errors

app/main/views/feedback.py

@@ -74,8 +74,17 @@ def feedback(ticket_type):
     if form.validate_on_submit():
         user_email = form.email_address.data
         user_name = form.name.data or None
-        feedback_msg = 'Environment: {}\n{}\n{}'.format(
+        if current_service:
+            service_string = 'Service "{name}": {url}\n'.format(
+                name=current_service['name'],
+                url=url_for('main.service_dashboard', service_id=current_service['id'], _external=True)
+            )
+        else:
+            service_string = ''
+
+        feedback_msg = 'Environment: {}\n{}{}\n{}'.format(
             url_for('main.index', _external=True),
+            service_string,
             '' if user_email else '{} (no email address supplied)'.format(form.name.data),
             form.feedback.data
         )