Require data on search by name form

This lets us build leaner views when using this form.

app/main/forms.py

@@ -1127,7 +1127,10 @@ class RequiredDateFilterForm(StripWhitespaceForm):
 
 class SearchByNameForm(StripWhitespaceForm):
 
-    search = SearchField('Search by name')
+    search = SearchField(
+        'Search by name',
+        validators=[DataRequired("You need to enter full or partial name to search by.")],
+    )
 
 
 class SearchUsersByEmailForm(StripWhitespaceForm):

app/main/views/find_services.py

@@ -1,4 +1,4 @@
-from flask import render_template, request
+from flask import render_template
 
 from app import service_api_client
 from app.main import main
@@ -11,13 +11,10 @@ from app.utils import user_is_platform_admin
 def find_services_by_name():
     form = SearchByNameForm()
     services_found = None
-    status = 200
     if form.validate_on_submit():
         services_found = service_api_client.find_services_by_name(service_name=form.search.data)['data']
-    elif request.method == 'POST':
-        status = 400
     return render_template(
         'views/find-services/find-services-by-name.html',
         form=form,
         services_found=services_found
-    ), status
+    )