bpo-35133: Fix mistakes when concatenate string literals on different lines. (GH-10284)


Two kind of mistakes:

1. Missed space. After concatenating there is no space between words.

2. Missed comma. Causes unintentional concatenating in a list of strings.
(cherry picked from commit 34fd4c20198dea6ab2fe8dc6d32d744d9bde868d)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Python/import.c b/Python/import.c
index 5d17947..709fc43 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -833,7 +833,7 @@
         if (!PyMapping_HasKey(modules, name)) {
             return;
         }
-        Py_FatalError("import:  deleting existing key in"
+        Py_FatalError("import:  deleting existing key in "
                       "sys.modules failed");
     }
 }