[MC-121806] JSON text component parser throws unhandled exceptions when incorrect data type was provided

The bug

The JSON text component parser throws unhandled exceptions when data of an incorrect type was provided. For example:

"text":[]
"text":"","extra":1

When using this while typing in chat the client crashes with the description keyPressed event handler, in command blocks the exception is written to the log.

(17w45b) crash-2017-11-10_22.17.47-client.txt

Description: charTyped event handler

java.lang.ClassCastException: com.google.gson.JsonPrimitive cannot be cast to com.google.gson.JsonObject
	at com.google.gson.JsonObject.getAsJsonObject(JsonObject.java:191)
        ...

(17w45b) crash-2017-11-10_22.26.44-client.txt

Description: charTyped event handler

java.lang.ClassCastException: com.google.gson.JsonPrimitive cannot be cast to com.google.gson.JsonArray
	at com.google.gson.JsonObject.getAsJsonArray(JsonObject.java:181)
        ...

(17w45b) crash-2017-11-10_22.31.10-client.txt

Description: keyPressed event handler

java.lang.IllegalStateException
	at com.google.gson.JsonArray.getAsString(JsonArray.java:215)
        ...

How to reproduce

Use the following command

/setblock ~ ~ ~ command_block{Command:"/tellraw @p {\"text\":[]}",auto:1b}

Look in the log