Fix crash when we don't have new_state or old_state in websocket.

[JBassett]

Summary

Fixes this:

2021-12-09 20:06:16.564 12564-19701/? E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-6
    Process: io.homeassistant.companion.android, PID: 12564
    java.lang.IllegalArgumentException: Instantiation of [simple type, class io.homeassistant.companion.android.common.data.websocket.impl.entities.StateChangedEvent] value failed for JSON property old_state due to missing (therefore NULL) value for creator parameter oldState which is a non-nullable type
        at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.homeassistant.companion.android.common.data.websocket.impl.entities.EventResponse["data"]->io.homeassistant.companion.android.common.data.websocket.impl.entities.StateChangedEvent["old_state"])
        at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4394)
        at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4335)
        at io.homeassistant.companion.android.common.data.websocket.impl.WebSocketRepositoryImpl.handleEvent(WebSocketRepositoryImpl.kt:241)
        at io.homeassistant.companion.android.common.data.websocket.impl.WebSocketRepositoryImpl.access$handleEvent(WebSocketRepositoryImpl.kt:47)
        at io.homeassistant.companion.android.common.data.websocket.impl.WebSocketRepositoryImpl$onMessage$1.invokeSuspend(WebSocketRepositoryImpl.kt:286)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
     Caused by: com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException: Instantiation of [simple type, class io.homeassistant.companion.android.common.data.websocket.impl.entities.StateChangedEvent] value failed for JSON property old_state due to missing (therefore NULL) value for creator parameter oldState which is a non-nullable type
        at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.homeassistant.companion.android.common.data.websocket.impl.entities.EventResponse["data"]->io.homeassistant.companion.android.common.data.websocket.impl.entities.StateChangedEvent["old_state"])
        at com.fasterxml.jackson.module.kotlin.KotlinValueInstantiator.createFromObjectWith(KotlinValueInstantiator.kt:116)
        at com.fasterxml.jackson.databind.deser.impl.PropertyBasedCreator.build(PropertyBasedCreator.java:202)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:443)
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1405)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:351)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:184)
        at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:542)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeWithErrorWrapping(BeanDeserializer.java:563)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:438)
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1405)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:351)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:184)
        at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4389)
        at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4335) 
        at io.homeassistant.companion.android.common.data.websocket.impl.WebSocketRepositoryImpl.handleEvent(WebSocketRepositoryImpl.kt:241) 
        at io.homeassistant.companion.android.common.data.websocket.impl.WebSocketRepositoryImpl.access$handleEvent(WebSocketRepositoryImpl.kt:47) 
        at io.homeassistant.companion.android.common.data.websocket.impl.WebSocketRepositoryImpl$onMessage$1.invokeSuspend(WebSocketRepositoryImpl.kt:286) 
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) 
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665) 

Screenshots

Link to pull request in Documentation repository

Documentation: home-assistant/companion.home-assistant#

Any other notes

[dshokouhi]

Looks good to me, tough to reproduce these ones