Remove the use of is_normalized function for Python 3.7.

web/pgadmin/tools/user_management/__init__.py

@@ -10,7 +10,11 @@
 """Implements pgAdmin4 User Management Utility"""
 
 import json
-from unicodedata import normalize, is_normalized
+
+import sys
+if sys.version_info >= (3, 8):
+    from unicodedata import normalize, is_normalized
+
 from flask import render_template, request, \
     Response, abort, current_app, session
 from flask_babel import gettext as _
@@ -442,6 +446,10 @@ def normalise_password(password):
         'NFKD'
     )
 
+    # Remove check of Python version once Python 3.7 support ends
+    if sys.version_info < (3, 8):
+        return password
+
     return password if is_normalized(normalise_form, password) else\
         normalize(normalise_form, password)