stanford-oval / thingtalk / 366

81%

master: 78%

Pull #85

travis-ci

SchemaRetriever: fix retrieving invalid devices

If the device does not exist, Thingpedia returns the empty string.

The empty string is a valid ThingTalk program, but after optimization
it becomes null rather than an AST. We need to recognize that and
return no classes to the caller, which then throws an error.

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