Fix pylint without QtWebEngine available

.pylintrc

@@ -14,6 +14,7 @@ disable=no-self-use,
         fixme,
         global-statement,
         locally-disabled,
+        locally-enabled,
         too-many-ancestors,
         too-few-public-methods,
         too-many-public-methods,

qutebrowser/browser/webengine/webenginetab.py

@@ -22,7 +22,9 @@
 from PyQt5.QtCore import pyqtSlot, Qt, QEvent
 from PyQt5.QtGui import QKeyEvent
 from PyQt5.QtWidgets import QApplication
+# pylint: disable=no-name-in-module,import-error,useless-suppression
 from PyQt5.QtWebEngineWidgets import QWebEnginePage
+# pylint: enable=no-name-in-module,import-error,useless-suppression
 
 from qutebrowser.browser import tab
 from qutebrowser.browser.webengine import webview

qutebrowser/browser/webengine/webview.py

@@ -21,7 +21,9 @@
 
 
 from PyQt5.QtCore import pyqtSignal, Qt, QPoint
+# pylint: disable=no-name-in-module,import-error,useless-suppression
 from PyQt5.QtWebEngineWidgets import QWebEngineView
+# pylint: enable=no-name-in-module,import-error,useless-suppression
 
 
 class WebEngineView(QWebEngineView):