#12220: improve minidom error when URI contains spaces.

Fix by 'amathew', test by Marek Stepniowski.
diff --git a/Misc/ACKS b/Misc/ACKS
index 65d1adb..4173917 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1255,6 +1255,7 @@
 Anthony Starks
 Oliver Steele
 Greg Stein
+Marek Stepniowski
 Baruch Sterin
 Chris Stern
 Alex Stewart