Suppress invalid warning from bs4, add 404 handler

An invalid parsing warning was being thrown by the latest version of the
bs4 library. This suppresses that warning from being shown in the
console.

A 404 handler was added to move logging from the console to the error
template, since a lot of users assumed that 404 errors from the result
page were problems with Whoogle itself.

Fixes #967

app/routes.py

@@ -557,6 +557,11 @@ def window():
     )
 
 
+@app.errorhandler(404)
+def page_not_found(e):
+    return render_template('error.html', error_message=str(e)), 404
+
+
 def run_app() -> None:
     parser = argparse.ArgumentParser(
         description='Whoogle Search console runner')

app/utils/results.py

@@ -1,6 +1,6 @@
 from app.models.config import Config
 from app.models.endpoint import Endpoint
-from bs4 import BeautifulSoup, NavigableString
+from bs4 import BeautifulSoup, NavigableString, MarkupResemblesLocatorWarning
 import copy
 from flask import current_app
 import html
@@ -8,6 +8,10 @@ import os
 import urllib.parse as urlparse
 from urllib.parse import parse_qs
 import re
+import warnings
+
+# Suppress incorrect warnings from bs4 related to parsing HTML content
+warnings.filterwarnings('ignore', category=MarkupResemblesLocatorWarning)
 
 SKIP_ARGS = ['ref_src', 'utm']
 SKIP_PREFIX = ['//www.', '//mobile.', '//m.', 'www.', 'mobile.', 'm.']