Improve document creation via sources app to trigger

correct event.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/sources/models.py

@@ -80,7 +80,7 @@ class Source(models.Model):
         """
         try:
             with transaction.atomic():
-                document = Document.objects.create(
+                document = Document(
                     description=description or '', document_type=document_type,
                     label=label or file_object.name,
                     language=language or setting_language.value