Warning when starting craftassist_agent

## Type of Issue

Select the type of issue:
- [ ] Bug report (to report a bug)
- [ ] Feature request (to request an additional feature)
- [ ] Tracker (I am just using this as a tracker)
- [ ] Refactor request
- [ ] Documentation Ask

## Description

```
2021-07-15 21:00:29,223 [loco_mc_agent.py:74 - init_event_handlers() INFO]: creating all tables for Visual programming and error annotation ...
/private/home/kavyasrinet/droidlet/agents/loco_mc_agent.py:368: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray
fn = np.random.choice(fns, p=p)
```