update

muk_fields_lobject/__manifest__.py

@@ -32,7 +32,7 @@
         They are useful with data values too large to be
         manipulated conveniently as a whole.
     """,
-    "version": '11.0.1.0.1',   
+    "version": '11.0.1.0.2',   
     "category": 'Extra Tools',   
     "license": "AGPL-3",
     "website": "http://www.mukit.at",

muk_fields_lobject/fields.py

@@ -58,7 +58,7 @@ class LargeObject(fields.Field):
         return lobject.oid
 
     def convert_to_record(self, value, record):
-        if value:
+        if value and isinstance(value, int):
             lobject = record.env.cr._cnx.lobject(value, 'rb')
             if record._context.get('human_size'):
                 return human_size(lobject.seek(0, 2))
@@ -76,7 +76,7 @@ class LargeObject(fields.Field):
                     file.write(chunk)
             else:
                 return lobject.read()
-        return False
+        return value
     
     def convert_to_export(self, value, record):
         if value:

muk_fields_lobject/models.py

@@ -39,7 +39,9 @@ def large_object_unlink(self):
         field = self._fields[name]
         if field.type == 'lobject' and field.store:
             for record in self:
-                oids.append(record.with_context({'oid': True})[name])
+                oid = record.with_context({'oid': True})[name]
+                if oid:
+                    oids.append(oid)
     unlink(self)
     for oid in oids:
         lobject = self.env.cr._cnx.lobject(oid, 'rb').unlink()