fic empty new edition

fix error when user click new edition without entering anything

core/loaders/__init__.py

@@ -43,6 +43,8 @@ def scrape_sitemap(url, maxnum=None):
         logger.error(e)
 
 def add_by_webpage(url, work=None, user=None):
+    if not url:
+        return None
     edition = None
     scraper = get_scraper(url)
     loader = BasePandataLoader(url)

core/loaders/utils.py

@@ -360,6 +360,8 @@ ID_URLPATTERNS = {
 
 def ids_from_urls(url):
     ids = {}
+    if not url:
+        return ids
     for ident, pattern in ID_URLPATTERNS.items():
         id_match = pattern.search(url)
         if id_match:

frontend/views/bibedit.py

@@ -160,12 +160,13 @@ def new_edition(request, by=None):
                 else:
                     edition = get_edition_for_id(id_type, id_value, user=request.user)
             
-            return HttpResponseRedirect(
-                reverse('new_edition', kwargs={
-                    'work_id': edition.work_id,
-                    'edition_id': edition.id
-                })
-            )
+            if edition:
+                return HttpResponseRedirect(
+                    reverse('new_edition', kwargs={
+                        'work_id': edition.work_id,
+                        'edition_id': edition.id
+                    })
+                )
     else:
         form = IdentifierForm()
     return render(request, 'new_edition.html', {'form': form, 'alert':alert})