Allow addition of dataset without resources

Temporary fix for ckan#377:

When ckan is configured with
`CKAN__DATASET__CREATE_ON_UI_REQUIRES_RESOURCES=False`, you should be
able to create a dataset without any resources but the scheming plugin
overrides this as it sets the state to draft until any resources are
added. This temporary fix means that the resources step is omitted from
the add dataset form and a catalog entry is created with no resources.

Not a solution worth actually using - the correct fix would allow the
option for something like "save without adding resources" on the
resource page instead of skipping over the resources. I haven't done
that since I don't need it for what I'm doing right now and it sounds
like the maintainers are on fixing the issue.

ckanext/scheming/views.py

@@ -2,7 +2,7 @@
 from flask import Response, Blueprint
 from flask.views import MethodView
 from werkzeug.datastructures import MultiDict
-
+from ckantoolkit import config
 from ckan.plugins.toolkit import (
     h, request, get_action, abort, _, ObjectNotFound, NotAuthorized,
     ValidationError,
@@ -83,8 +83,15 @@ def post(self, package_type, id, page):
                 data_dict[u'tag_string']
             )
         data_dict.pop('pkg_name', None)
-        data_dict['state'] = 'draft'
-        # END: roughly copied from ckan/views/dataset.py
+
+
+        # Only set the state to draft if wither we need to add resources, or this is the last page of metadata
+        create_on_ui_requires_resources = config.get('ckan.dataset.create_on_ui_requires_resources')
+        pages = h.scheming_get_dataset_form_pages(package_type)
+        is_last_page = page == len(pages)
+        if not is_last_page or create_on_ui_requires_resources:
+            data_dict['state'] = 'draft'
+
 
         data_dict['id'] = id
         try:
@@ -109,9 +116,8 @@ def post(self, package_type, id, page):
             )
             # END: roughly copied from ckan/views/dataset.py
 
-        if page == len(h.scheming_get_dataset_form_pages(package_type)):
-            # BEGIN: roughly copied from ckan/views/dataset.py
-            if 'resource_fields' in h.scheming_get_dataset_schema(package_type):
+        if page == len(pages):
+            if 'resource_fields' in h.scheming_get_dataset_schema(package_type) and create_on_ui_requires_resources:
                 return h.redirect_to(
                     '{}_resource.new'.format(package_type),
                     id=data['name'],
@@ -121,7 +127,18 @@ def post(self, package_type, id, page):
                 id=data['name'],
             )
             # END: roughly copied from ckan/views/dataset.py
-
+        url = h.url_for(
+            u'{}_resource.new'.format(package_type),
+            id=data[u'name']
+        )
+        if create_on_ui_requires_resources:
+            # redirect to add dataset resources if
+            # create_on_ui_requires_resources is set to true
+            url = h.url_for(
+                u'{}_resource.new'.format(package_type),
+                id=data[u'name']
+            )
+            return h.redirect_to(url)
         return h.redirect_to(
             '{}.scheming_new_page'.format(package_type),
             id=complete_data['name'],