Patch Anki 2.1.50 on Windows to have valid stdout

Something in Anki is setting stdout to Null.
This is a problem because Anki itself is writing to it,
particularly when printing warnings about
the deprecated methods that we are using.

This patches Anki using the same method that
the upcoming Anki 2.1.51 is using.

plugin/__init__.py

@@ -27,6 +27,7 @@
 import json
 import os
 import os.path
+import platform
 import re
 import time
 import unicodedata
@@ -1619,6 +1620,9 @@ def importPackage(self, path):
 # when run inside Anki, `__name__` would be either numeric,
 # or, if installed via `link.sh`, `AnkiConnectDev`
 if __name__ != "plugin":
+    if platform.system() == "Windows" and anki_version == (2, 1, 50):
+        util.patch_anki_2_1_50_having_null_stdout_on_windows()
+
     Edit.register_with_anki()
 
     ac = AnkiConnect()

plugin/util.py

@@ -14,6 +14,7 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 import os
+import sys
 
 import anki
 import anki.sync
@@ -83,3 +84,10 @@ def setting(key):
         return aqt.mw.addonManager.getConfig(__name__).get(key, DEFAULT_CONFIG[key])
     except:
         raise Exception('setting {} not found'.format(key))
+
+
+# see https://github.com/FooSoft/anki-connect/issues/308
+# fixed in https://github.com/ankitects/anki/commit/0b2a226d
+def patch_anki_2_1_50_having_null_stdout_on_windows():
+    if sys.stdout is None:
+        sys.stdout = open(os.devnull, "w", encoding="utf8")