Fix pylint errors.

authentication.py

@@ -4,10 +4,7 @@
 # This program is free software, distributed under the terms of
 # the GNU General Public License Version 2.
 
-import os.path
-import re
-
-from flask import Blueprint, Response, request, g
+from flask import Blueprint, Response, request
 import config
 
 

directory.py

@@ -4,7 +4,6 @@
 # This program is free software, distributed under the terms of
 # the GNU General Public License Version 2.
 
-import os.path
 import re
 from math import ceil
 from urllib.parse import quote_plus
@@ -181,8 +180,6 @@ def directory_menuitem():
 def before_request():
     g.is_79xx = re.search(r'(?x) ^ CP-79', request.headers.get('X-CiscoIPPhoneModelName', ''))
 
-    return None
-
 
 @blueprint.errorhandler(Exception)
 def error_handler(error):

information.py

@@ -4,13 +4,11 @@
 # This program is free software, distributed under the terms of
 # the GNU General Public License Version 2.
 
-import os.path
 import re
 from html import escape
 
 from lxml import etree
-from flask import Blueprint, Response, request, g
-import config
+from flask import Blueprint, Response, request
 
 
 blueprint = Blueprint('information', __name__)
@@ -24,6 +22,10 @@ def help_information():
         return Response('Invalid id', mimetype = 'text/plain'), 500
 
     document = etree.parse('./phone_help.xml')
+
+    if not document:
+        return Response('XML error', mimetype = 'text/plain'), 500
+
     element = document.find(f'HelpItem[ID="{id}"]')
 
     if element:

problem_report.py

@@ -4,7 +4,6 @@
 # This program is free software, distributed under the terms of
 # the GNU General Public License Version 2.
 
-import os.path
 import re
 from datetime import datetime
 

services.py

@@ -4,7 +4,6 @@
 # This program is free software, distributed under the terms of
 # the GNU General Public License Version 2.
 
-import os.path
 import re
 from urllib.parse import quote_plus
 from html import escape
@@ -109,8 +108,6 @@ def parked_calls():
 def before_request():
     g.is_79xx = re.search(r'(?x) ^ CP-79', request.headers.get('X-CiscoIPPhoneModelName', ''))
 
-    return None
-
 
 @blueprint.errorhandler(Exception)
 def error_handler(error):