Fix insert, gallery, sizing, type queries, errors, thumbs, type fallback. Props andy. see #5911

git-svn-id: https://develop.svn.wordpress.org/trunk@7172 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/includes/file.php

@@ -159,6 +159,9 @@ function wp_handle_upload( &$file, $overrides = false ) {
 
 		if ( !$ext )
 			$ext = ltrim(strrchr($file['name'], '.'), '.');
+
+		if ( !$type )
+			$type = $file['type'];
 	}
 
 	// A writable uploads dir will pass this test. Again, there's no point overriding this one.