bpo-39040: Fix parsing of email headers with whitespace between encod…

Remove empty lines, add a new test and update the news entry.
python · maxking · maxking · maxking · Dec 16, 2019 · maxking
diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
diff --git a/Lib/test/test_email/test_headerregistry.py b/Lib/test/test_email/test_headerregistry.py
diff --git a/Misc/NEWS.d/next/Library/2019-12-15-18-47-20.bpo-39040.tKa0Qs.rst b/Misc/NEWS.d/next/Library/2019-12-15-18-47-20.bpo-39040.tKa0Qs.rst
diff --git a/Lib/test/test_email/test_headerregistry.py b/Lib/test/test_email/test_headerregistry.py
+            [],
+            'attachment; filename="File Name With Spaces.pdf"',
+            ('Content-Disposition: attachment; '
+             'filename="File Name With Spaces.pdf"\n'),