./develop.sh run --rm webserver python2 manage.py dump full_db

Starting acousticbrainzserver_redis_1 ... done
Creating full database dump...
Traceback (most recent call last):
 File "manage.py", line 157, in <module>
 cli()
 File "/usr/local/lib/python2.7/site-packages/click/core.py", line 716, in __call__
 return self.main(*args, **kwargs)
 File "/usr/local/lib/python2.7/site-packages/flask/cli.py", line 380, in main
 return AppGroup.main(self, *args, **kwargs)
 File "/usr/local/lib/python2.7/site-packages/click/core.py", line 696, in main
 rv = self.invoke(ctx)
 File "/usr/local/lib/python2.7/site-packages/click/core.py", line 1060, in invoke
 return _process_result(sub_ctx.command.invoke(sub_ctx))
 File "/usr/local/lib/python2.7/site-packages/click/core.py", line 1060, in invoke
 return _process_result(sub_ctx.command.invoke(sub_ctx))
 File "/usr/local/lib/python2.7/site-packages/click/core.py", line 889, in invoke
 return ctx.invoke(self.callback, **ctx.params)
 File "/usr/local/lib/python2.7/site-packages/click/core.py", line 534, in invoke
 return callback(*args, **kwargs)
 File "/code/db/dump_manage.py", line 46, in full_db
 path = dump.dump_db(location, threads)
 File "/code/db/dump.py", line 143, in dump_db
 _copy_tables(archive_tables_dir, start_t, end_t)
 File "/code/db/dump.py", line 175, in _copy_tables
 connection = db.engine.raw_connection()
AttributeError: 'NoneType' object has no attribute 'raw_connection'