Fix some LGTM issues

Closes #4678

misc/userscripts/getbib

@@ -14,7 +14,6 @@ https://ocefpaf.github.io/python4oceanographers/blog/2014/05/19/doi2bibtex/
 
 import os
 import sys
-import shutil
 import re
 from collections import Counter
 from urllib import parse as url_parse

misc/userscripts/qute-bitwarden

@@ -46,10 +46,8 @@ WARNING: The login details are viewable as plaintext in qutebrowser's debug log
 
 import argparse
 import enum
-import fnmatch
 import functools
 import os
-import re
 import shlex
 import subprocess
 import sys

misc/userscripts/qute-lastpass

@@ -39,10 +39,8 @@ you decide to submit a crash report!"""
 
 import argparse
 import enum
-import fnmatch
 import functools
 import os
-import re
 import shlex
 import subprocess
 import sys

misc/userscripts/readability-js

@@ -59,7 +59,7 @@ const HEADER = `
 </head>`;
 const scriptsDir = path.join(process.env.QUTE_DATA_DIR, 'userscripts');
 const tmpFile = path.join(scriptsDir, '/readability.html');
-const domOpts = {url: process.env.QUTE_URL, contentType: "text/html; charset=utf-8"}
+const domOpts = {url: process.env.QUTE_URL, contentType: "text/html; charset=utf-8"};
 
 if (!fs.existsSync(scriptsDir)){
     fs.mkdirSync(scriptsDir);

qutebrowser/app.py

@@ -173,7 +173,6 @@ def init(*, args: argparse.Namespace) -> None:
 
 def _init_icon():
     """Initialize the icon of qutebrowser."""
-    icon = QIcon()
     fallback_icon = QIcon()
     for size in [16, 24, 32, 48, 64, 96, 128, 256, 512]:
         filename = ':/icons/qutebrowser-{size}x{size}.png'.format(size=size)

qutebrowser/javascript/pac_utils.js

@@ -241,7 +241,7 @@ function timeRange() {
             }
             break;
         default:
-          throw 'timeRange: bad number of arguments'
+          throw 'timeRange: bad number of arguments';
         }
     }
 

qutebrowser/utils/objreg.py

@@ -170,9 +170,7 @@ def _get_tab_registry(win_id: _WindowTab,
         if window is None or not hasattr(window, 'win_id'):
             raise RegistryUnavailableError('tab')
         win_id = window.win_id
-    elif win_id is not None:
-        window = window_registry[win_id]
-    else:
+    elif win_id is None:
         raise TypeError("window is None with scope tab!")
 
     if tab_id == 'current':