Code cosmetics

Bugfix missing bleach tags (#3080)
Bugfix pdfreader

cps/main.py

@@ -27,6 +27,7 @@ from flask import request
 def request_username():
     return request.authorization.username
 
+
 def main():
     app = create_app()
 
@@ -48,12 +49,14 @@ def main():
         kobo_available = get_kobo_activated()
     except (ImportError, AttributeError):  # Catch also error for not installed flask-WTF (missing csrf decorator)
         kobo_available = False
+        kobo, kobo_auth,get_remote_address = None
 
     try:
         from .oauth_bb import oauth
         oauth_available = True
     except ImportError:
         oauth_available = False
+        oauth = None
 
     from . import web_server
     init_errorhandler()
@@ -62,7 +65,7 @@ def main():
     app.register_blueprint(tasks)
     app.register_blueprint(web)
     app.register_blueprint(opds)
-    limiter.limit("3/minute",key_func=request_username)(opds)
+    limiter.limit("3/minute", key_func=request_username)(opds)
     app.register_blueprint(jinjia)
     app.register_blueprint(about)
     app.register_blueprint(shelf)