catching greasemonkey errors aswell

qutebrowser/browser/commands.py

@@ -2087,7 +2087,7 @@ class CommandDispatcher:
         widget = self._current_widget()
         try:
             widget.run_js_async(js_code, callback=jseval_cb, world=world)
-        except OverflowError as e:
+        except OverflowError:
             raise cmdexc.CommandError("World Id not in valid range")
 
     @cmdutils.register(instance='command-dispatcher', scope='window')

qutebrowser/browser/webengine/webenginetab.py

@@ -948,6 +948,11 @@ class _WebEngineScripts(QObject):
             new_script = QWebEngineScript()
             try:
                 world = int(script.jsworld)
+                if not 0 <= world < 256:
+                    log.greasemonkey.error(
+                        "script {} has invalid value for '@qute-js-world'"
+                        ": {}".format(script.name, script.jsworld))
+                    continue
             except ValueError:
                 try:
                     world = _JS_WORLD_MAP[usertypes.JsWorld[