getDefaultCursor exception fixed

web-greeter/browser/browser.py

@@ -87,9 +87,13 @@ ENABLED_SETTINGS = [
 
 def getDefaultCursor():
     cursor_theme = ""
+    matched = None
+    try:
         file = open("/usr/share/icons/default/index.theme")
         matched = re.search(r"Inherits=.*", file.read())
         file.close()
+    except Exception:
+        return ""
     if not matched:
         logger.error("Default cursor couldn't be get")
         return ""