Issue #15715: Ignore failed imports triggered by the use of fromlist.

When the fromlist argument is specified for __import__() and the
attribute doesn't already exist, an import is attempted. If that fails
(e.g. module doesn't exist), the ImportError will now be silenced (for
backwards-compatibility). This *does not* affect
``from ... import ...`` statements.

Thanks to Eric Snow for the patch and Simon Feltman for reporting the
regression.
diff --git a/Misc/NEWS b/Misc/NEWS
index 55f99a7..b7b4a56 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -16,6 +16,9 @@
 Library
 -------
 
+- Issue #15715: importlib.__import__() will silence an ImportError when the use
+  of fromlist leads to a failed import.
+
 - Issue #14669: Fix pickling of connections and sockets on MacOSX
   by sending/receiving an acknowledgment after file descriptor transfer.
   TestPicklingConnection has been reenabled for MacOSX.