rename template var in send_test_step

it's confusing reassigining one template (json from api) to another
type (utils object) on one line.

Also removed an unnecessary bounds check (since if placeholders is
empty the IndexError will throw on the next line anyway and it'll
be handled the same), and moved get_back_link out to its own function

app/main/views/send.py

@@ -15,7 +15,6 @@ from flask import (
     abort,
     session,
     current_app,
-    send_file,
 )
 
 from flask_login import login_required, current_user
@@ -24,7 +23,6 @@ from notifications_utils.columns import Columns
 from notifications_utils.recipients import (
     RecipientCSV,
     first_column_headings,
-    validate_and_format_phone_number,
     optional_address_columns,
 )
 
@@ -32,14 +30,13 @@ from app.main import main
 from app.main.forms import (
     CsvUploadForm,
     ChooseTimeForm,
-    get_furthest_possible_scheduled_time,
     get_placeholder_form_instance
 )
 from app.main.uploader import (
     s3upload,
     s3download
 )
-from app import job_api_client, service_api_client, current_service, user_api_client
+from app import job_api_client, service_api_client, current_service, user_api_client, notification_api_client
 from app.utils import (
     user_has_permissions,
     get_errors_for_csv,
@@ -93,10 +90,10 @@ def get_example_letter_address(key):
 @user_has_permissions('send_texts', 'send_emails', 'send_letters')
 def send_messages(service_id, template_id):
 
-    template = service_api_client.get_service_template(service_id, template_id)['data']
+    db_template = service_api_client.get_service_template(service_id, template_id)['data']
 
     template = get_template(
-        template,
+        db_template,
         current_service,
         show_recipient=True,
         expand_emails=True,
@@ -105,7 +102,7 @@ def send_messages(service_id, template_id):
             service_id=service_id,
             template_id=template_id,
             filetype='png',
-            page_count=get_page_count_for_letter(template),
+            page_count=get_page_count_for_letter(db_template),
         ),
     )
 
@@ -200,13 +197,13 @@ def send_test_step(service_id, template_id, step_index):
             template_id=template_id,
         ))
 
-    template = service_api_client.get_service_template(service_id, template_id)['data']
+    db_template = service_api_client.get_service_template(service_id, template_id)['data']
 
     if not session.get('send_test_letter_page_count'):
-        session['send_test_letter_page_count'] = get_page_count_for_letter(template)
+        session['send_test_letter_page_count'] = get_page_count_for_letter(db_template)
 
     template = get_template(
-        template,
+        db_template,
         current_service,
         show_recipient=True,
         expand_emails=True,
@@ -224,9 +221,6 @@ def send_test_step(service_id, template_id, step_index):
         prefill_current_user=(request.endpoint == 'main.send_test_step'),
     )
 
-    if len(placeholders) == 0:
-        return make_and_upload_csv_file(service_id, template)
-
     try:
         current_placeholder = placeholders[step_index]
     except IndexError:
@@ -240,6 +234,7 @@ def send_test_step(service_id, template_id, step_index):
             service_id=service_id,
             template_id=template_id,
         ))
+
     optional_placeholder = (current_placeholder in optional_address_columns)
     form = get_placeholder_form_instance(
         current_placeholder,
@@ -263,21 +258,7 @@ def send_test_step(service_id, template_id, step_index):
             help=get_help_argument(),
         ))
 
-    if get_help_argument():
-        back_link = None
-    elif step_index == 0:
-        back_link = url_for(
-            '.view_template',
-            service_id=service_id,
-            template_id=template_id,
-        )
-    else:
-        back_link = url_for(
-            request.endpoint,
-            service_id=service_id,
-            template_id=template_id,
-            step_index=step_index - 1,
-        )
+    back_link = get_back_link(service_id, template_id, step_index)
 
     template.values = get_normalised_send_test_values_from_session()
     template.values[current_placeholder] = None
@@ -314,10 +295,10 @@ def send_test_preview(service_id, template_id, filetype):
     if filetype not in ('pdf', 'png'):
         abort(404)
 
-    template = service_api_client.get_service_template(service_id, template_id)['data']
+    db_template = service_api_client.get_service_template(service_id, template_id)['data']
 
     template = get_template(
-        template,
+        db_template,
         current_service,
         letter_preview_url=url_for(
             '.send_test_preview',
@@ -568,3 +549,21 @@ def get_send_test_page_title(template_type, help_argument):
     if template_type == 'letter':
         return 'Print a test letter'
     return 'Send to one recipient'
+
+
+def get_back_link(service_id, template_id, step_index):
+    if get_help_argument():
+        return None
+    elif step_index == 0:
+        return url_for(
+            '.view_template',
+            service_id=service_id,
+            template_id=template_id,
+        )
+    else:
+        return url_for(
+            request.endpoint,
+            service_id=service_id,
+            template_id=template_id,
+            step_index=step_index - 1,
+        )