pgAdmin 4 commit: Fix an issue where setting STORAGE_DIR to empty shoul

Fix an issue where setting STORAGE_DIR to empty should show all the volumes on Windows in server mode. Fixes #5025.

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=9dccd20bb3617ad9abcc706eb796d9c227b8d7a5
Author: Simon Wimmesberger <simon.wimmesberger@zoetis.com>

Modified Files
--------------
docs/en_US/release_notes_4_18.rst         |  1 +
web/pgadmin/misc/file_manager/__init__.py | 21 ++++++++++-----------
web/pgadmin/setup/data_directory.py       |  2 +-
3 files changed, 12 insertions(+), 12 deletions(-)