Retrieve ARKINDEX_CORPUS_ID in create_entity when corpus is None

Closes #61 (closed)

arkindex_worker/worker/entity.py

@@ -18,7 +18,9 @@ class EntityType(Enum):
 
 
 class EntityMixin(object):
-    def create_entity(self, element, name, type, corpus, metas=None, validated=None):
+    def create_entity(
+        self, element, name, type, corpus=None, metas=None, validated=None
+    ):
         """
         Create an entity on the given corpus through API
         Return the ID of the created entity