Symbol targeting directory not resolved on whatis/paths if implicit_default is disabled

[xdelaruelle]

When a symbolic version targets a directory:

$ module use modules/testsuite/modulefiles
$ module avail -l loc_dv7/default
- Package/Alias -----------------------.- Versions --------.- Last mod. -------
/path/to/modules/testsuite/modulefiles:
loc_dv7/2.0/                            default

If implicit_default configuration is disabled

$ module config implicit_default 0

A different result is obtained on whatis sub-command whether symbolic name or target is passed as argument:

$ module whatis loc_dv7/default
ERROR: No default version defined for 'loc_dv7/2.0'
$ module whatis loc_dv7/2.0
----- /path/to/modules/testsuite/modulefiles -----
     loc_dv7/2.0/1.0: loc_dv7/2.0/1.0

Same goes for the paths sub-command:

$ module paths loc_dv7/2.0
/path/to/modules/testsuite/modulefiles/loc_dv7/2.0/1.0
$ module paths loc_dv7/default
$

Would expect the same result whatever the argument is (symbol or actual target)