sbmd of newly installed module is incomplete preventing module deletion

For newly installed modules SwordBookDriver.isDeletable returns false.
The reason for this is that sbmd.getConfigFile() is null for newly installed modules.

This is because AbstractSwordInstaller.loadCachedIndex() uses
new SwordBookMetaData(buffer, internal);

which uses:
cet.load(byte[]) // does not set configFile

instead of
cet.load(File) // sets configFile

I am not sure of the best solution to this. I can attempt a change if somebody suggests an appropriate fix.