second app instance not working

[Jeff17Robbins]

The createCanvas call throws an error, and the error handling code assumes that the error object has a data object, but that object is null. The error message is:

The conditional request failed (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ConditionalCheckFailedException; Request ID: CDG8DQK720CJA210C65IH2T7E3VV4KQNSO5AEMVJF66Q9ASUAAJG)

[Jeff17Robbins]

Apparently AppSync's behavior must have changed since this app was written. Changing the resolver for Mutation.createCanvas
to this seems to fix the problem.

#if( $ctx.error )
#if ( $ctx.error.type.equals("DynamoDB:ConditionalCheckFailedException") )
$util.toJson($ctx.result)
#else
$util.error($ctx.error.message, $ctx.error.type)
#end
#else
$util.toJson($ctx.result)
#end