getBlob for non-existent containers does not throw a ContainerNotFoundException

As per the documentation[1], the BlobStore object should throw a ContainerNotFoundException if the container does not exist when the getBlob API is invoked. However, I see that the call to getBlob silently succeeds when the container doesn't exist. I tested this against aws-s3, swift and cloudfiles-us.

[1] http://jclouds.apache.org/reference/javadoc/1.7.x/org/jclouds/blobstore/BlobStore.html#getBlob(java.lang.String, java.lang.String)