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

[xdelaruelle]

When a module alias targets a directory:

$ module use modules/testsuite/modulefiles.deep
$ module avail -l modtr/al5
- Package/Alias -----------------------.- Versions --------.- Last mod. -------
/path/to/modules/testsuite/modulefiles.deep:
modtr/al5 -> modtr/dir4                 fld                 
$ module avail -l modtr/dir4
- Package/Alias -----------------------.- Versions --------.- Last mod. -------
/path/to/modules/testsuite/modulefiles.deep:
modtr/dir4/                             fld                 
modtr/dir4/al7 -> modtr/dir5/subdir/mod5.0madj              
modtr/dir4/al8 -> modtr/dir5/sfld       dadj                
modtr/dir4/mod4.0                                           2019/08/30 07:43:24

If implicit_default configuration is disabled

$ module config implicit_default 0

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

$ module whatis modtr/al5
ERROR: No default version defined for 'modtr/dir4'
$ module whatis modtr/dir4
----- /path/to/modules/testsuite/modulefiles.deep -----
   modtr/dir4/mod4.0: modtr/dir4/mod4.0
modtr/dir5/subdir/mod5.0: modtr/dir5/subdir/mod5.0

Same goes for the paths sub-command:

$ module paths modtr/al5
$ module paths modtr/dir4
/path/to/modules/testsuite/modulefiles.deep/modtr/dir4/mod4.0
/path/to/modules/testsuite/modulefiles.deep/modtr/dir5/subdir/mod5.0
$

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