Fix disabled warning not ignored

ChangeLog

@@ -13,11 +13,16 @@ Release date: Undefined
 
 What's New in Pylint 2.7.4?
 ===========================
-Release date: Undefined
+Release date: 2021-03-30
 
 ..
   Put bug fixes that will be cherry-picked to latest major version here
 
+
+* Fix a problem with disabled msgid not being ignored
+
+  Closes #4265
+
 * Fix issue with annotated class constants
 
   * Closes #4264

pylint/__pkginfo__.py

@@ -31,8 +31,8 @@
 from os.path import join
 
 # For an official release, use dev_version = None
-numversion = (2, 8, 0)
-dev_version = 1
+numversion = (2, 7, 4)
+dev_version = None
 
 version = ".".join(str(num) for num in numversion)
 if dev_version is not None:

pylint/message/message_handler_mix_in.py

@@ -45,10 +45,14 @@ def get_by_id_managed_msgs(cls):
     def _register_by_id_managed_msg(self, msgid_or_symbol: str, line, is_disabled=True):
         """If the msgid is a numeric one, then register it to inform the user
         it could furnish instead a symbolic msgid."""
-        if msgid_or_symbol[1:].isdigit():
-            symbol = self.msgs_store.message_id_store.get_symbol(msgid=msgid_or_symbol)  # type: ignore
-            managed = (self.current_name, msgid_or_symbol, symbol, line, is_disabled)  # type: ignore
-            MessagesHandlerMixIn.__by_id_managed_msgs.append(managed)
+        try:
+            if msgid_or_symbol[1:].isdigit():
+                symbol = self.msgs_store.message_id_store.get_symbol(msgid=msgid_or_symbol)  # type: ignore
+                msgid = msgid_or_symbol
+                managed = (self.current_name, msgid, symbol, line, is_disabled)  # type: ignore
+                MessagesHandlerMixIn.__by_id_managed_msgs.append(managed)
+        except KeyError:
+            pass
 
     def disable(self, msgid, scope="package", line=None, ignore_unknown=False):
         """Don't output message of the given id"""

tests/functional/d/disabled_msgid_in_pylintrc.py

@@ -0,0 +1,6 @@
+"""https://github.com/PyCQA/pylint/issues/4265"""
+
+try:
+    f = open('test')
+except Exception:
+    pass

tests/functional/d/disabled_msgid_in_pylintrc.rc

@@ -0,0 +1,4 @@
+[MESSAGES CONTROL]
+
+disable=
+    C0111,C0326,W0703