Currently BundleComponent.isValidBundle() is used to check if a bundle
is valid and should be considered for the baseline. If the location
points to something that chase no manifest at all (or an invalid
manifest) this currently an exception even though the API doc clearly
states that "Validity is determined via the existence of a readable
manifest file"

This now adds two checks

1) the location points to a file that exits and is larger than zero
bytes
2) parsing the manifest from the location do not throw an exception