Fix error when returning error for getConfiguration

[ajwild]

The following code from the getConfiguration function throws an error because app does not exist:

error = {
  "error": "The configuration could not be obtained.",
  "log": app.error || ""
};

Personally I don't think it's an error if the configuration doesn't exist, the function should just return undefined. However, I didn't want to change anything because there may be some apps waiting for the error message.