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Currently the last backend error string is only set when calling AudioBackend::start. Errors that occur when calling other AudioBackend methods like AudioBackend::set_buffer_size do not set the last backend error string. So until all the required AudioBackend methods return an ErrorCode and last_backend_error() can be removed just set it to a default string. Until all errors that occur are correctly indicated by returning an error code there will still be situations where last_backend_error() is not indicative of the true error. For instance AudioEngine::start is called and it fails but returns a valid error code so last_backend_error() is set, then some other engine/backend method is called that fails and as last_backend_error is not set the GUI will display the incorrect error message.
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