empty-comment line number bug fix

ChangeLog

@@ -1,6 +1,10 @@
 ------------------
 Pylint's ChangeLog
 ------------------
+* Bug fix for empty-comment message line number.
+
+  Closes #4009
+
 * Only emit `bad-reversed-sequence` on dictionaries if below py3.8
 
   Closes #3940

pylint/extensions/empty_comment.py

@@ -49,7 +49,7 @@ def process_module(self, node):
                 line = line.rstrip()
                 if line.endswith(b"#"):
                     if not is_line_commented(line[:-1]):
-                        self.add_message("empty-comment", line=line_num)
+                        self.add_message("empty-comment", line=line_num + 1)
 
 
 def register(linter):

tests/extensions/test_empty_comment.py

@@ -28,7 +28,7 @@ def test_comment_base_case(linter):
     for msg in msgs:
         assert msg.symbol == "empty-comment"
         assert msg.msg == "Line with empty comment"
-    assert msgs[0].line == 1
-    assert msgs[1].line == 2
-    assert msgs[2].line == 4
-    assert msgs[3].line == 6
+    assert msgs[0].line == 2
+    assert msgs[1].line == 3
+    assert msgs[2].line == 5
+    assert msgs[3].line == 7