Make sure bigquery exporter doesn't crash when a query fails

[cristinaleonr]

When a query fails, fails if one of its queries errors out.

A recent example of this issue came up when the queries for the scamper1 data type were released, but the table did not exist yet, which cause a query error, and subsequently bigquery exporter to crash.

2021/10/27 21:55:55 main.go:88: Failed to register collector: aborting (error: googleapi: Error 404: Not found: Table mlab-oti:ndt.scamper1 was not found in location US, notFound)