Avoid SQL error log

[nojaf]

Fixes #119

Okay, turns out this was working after all but very misleading.
I did see

But we already deal with this in:

mlflow-go-backend/mlflow_go_backend/store/tracking.py

Lines 87 to 99 in 8a621cc

	def get_experiment_by_name(self, experiment_name):
	request = GetExperimentByName(experiment_name=experiment_name)
	try:
	response = self.service.call_endpoint(
	get_lib().TrackingServiceGetExperimentByName, request
	)
	return Experiment.from_proto(response.experiment)
	except MlflowException as e:
	if e.error_code == databricks_pb2.ErrorCode.Name(
	databricks_pb2.RESOURCE_DOES_NOT_EXIST
	):
	return None
	raise

[dsuhinin]

Looks good!