The `prev_state` field on events is not specced and so synapse shouldn't explode if an event is missing the field. Fixes #4787  | 
			||
|---|---|---|
| .. | ||
| __init__.py | ||
| builder.py | ||
| snapshot.py | ||
| spamcheck.py | ||
| utils.py | ||
| validator.py | ||
				
					
						
							The `prev_state` field on events is not specced and so synapse shouldn't explode if an event is missing the field. Fixes #4787  | 
			||
|---|---|---|
| .. | ||
| __init__.py | ||
| builder.py | ||
| snapshot.py | ||
| spamcheck.py | ||
| utils.py | ||
| validator.py | ||