Item11928: revert Item11666 change to default radio and checkboxes

see http://trac.foswiki.org/changeset/14449



git-svn-id: http://svn.foswiki.org/trunk@15654 0b4bb1d4-4e5a-0410-9cc4-b2b747904278

core/lib/Foswiki/Form/Radio.pm

@@ -28,12 +28,6 @@ sub finish {
     undef $this->{valueMap};
 }
 
-# From System.DataForms, "The first item in the list for a select or
-# radio type is the default item."
-sub getDefaultValue {
-    return shift->getOptions()->[0];
-}
-
 sub getOptions {
     my $this = shift;
 

core/lib/Foswiki/Form/Select.pm

@@ -31,13 +31,14 @@ sub new {
 =begin TML
 
 ---++ getDefaultValue() -> $value
-From System.DataForms, "The first item in the list for a select or
-radio type is the default item."
+The default for a select is always the empty string, as there is no way in
+Foswiki form definitions to indicate selected values. This defers the decision
+on a value to the browser.
 
 =cut
 
 sub getDefaultValue {
-    return shift->getOptions()->[0];
+    return '';
 }
 
 sub getOptions {