It's possible that we could retrieve a conversion state file successfully, but the contents could be invalid. However, in such a situation the error message is misleading and makes it look like a connection failure.

To replicate, call the ConversionHost#get_conversion_state and have it retrieve an invalid json file.

The current result is that the error message will say "Could not get state file...".

The expected result is "Could not parse conversion state data...".