pylint: Enable emptystring extension

.pylintrc

@@ -7,7 +7,8 @@ load-plugins=qute_pylint.config,
              qute_pylint.modeline,
              qute_pylint.openencoding,
              qute_pylint.settrace,
-             pylint.extensions.docstyle
+             pylint.extensions.docstyle,
+             pylint.extensions.emptystring,
 persistent=n
 
 [MESSAGES CONTROL]

qutebrowser/utils/urlmatch.py

@@ -161,7 +161,7 @@ class UrlPattern:
 
         if parsed.path == '/*':
             self._path = None
-        elif parsed.path == '':
+        elif not parsed.path:
             # When the user doesn't add a trailing slash, we assume the pattern
             # matches any path.
             self._path = None

qutebrowser/utils/urlutils.py

@@ -490,7 +490,7 @@ def same_domain(url1, url2):
 
     suffix1 = url1.topLevelDomain()
     suffix2 = url2.topLevelDomain()
-    if suffix1 == '':
+    if not suffix1:
         return url1.host() == url2.host()
 
     if suffix1 != suffix2:

scripts/dev/run_pylint_on_tests.py

@@ -57,6 +57,7 @@ def main():
         'missing-docstring',
         'protected-access',
         'len-as-condition',
+        'compare-to-empty-string',
         # directories without __init__.py...
         'import-error',
     ]