Rails does not recognize the "text/*" MIME type

Some web crawlers use the "text/*" MIME type in the HTTP ACCEPT header in their request. This makes Rails throw a MissingTemplate error.

This ticket covers only the part that "text/*" should return any text type (e.g. text/html, text/plain). And "image/*" any image type for that matter.

Note that this issue is not the same as #5113 MissingTemplate issues in Rails 3.0 due to badly set MIME types..., which covers the MissingTemplate part, instead of returning a 406 (Not Acceptable), if the HTTP ACCEPT header requests only MIME types for which the respond_to block does not have an adequate response.