Prevent parameter reference..

couchpotato/core/plugins/base.py

@@ -95,7 +95,10 @@ class Plugin(object):
         return False
 
     # http request
-    def urlopen(self, url, timeout = 30, params = {}, headers = {}, opener = None, multipart = False, show_error = True):
+    def urlopen(self, url, timeout = 30, params = None, headers = None, opener = None, multipart = False, show_error = True):
+
+        if not headers: headers = {}
+        if not params: params = {}
 
         # Fill in some headers
         if not headers.get('Referer'):