cachescheme HTMLVersionTable get{Version, Path, Filename} methods can return
the wrong data if any of the data is incomplete (missing) for an
entry in the version table.

Example: If the version data is missing from the entry then
getVersion will return the Path data
getPath will return the Filename data
getFilename a java.util.NoSuchElementException will be thrown
(instead of what should have been thrown EntryNotFoundException)