[1.2.X] Fixed #15122 -- Restored reporting of the template files tried in the...

[1.2.X] Fixed #15122 -- Restored reporting of the template files tried in the texmplate loader post mortem section of the TemplateDoesNotExit 500 error debug page. Thanks rdrey for reporting this regression.

Backport of [15252] from trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15253 bcc190cf-cafb-0310-a4f2-bffc1f526a37