This is a quick and dirty fix, you should really override the admin class so as not to lose the changes during the next update.
In any case, in the file app/code/core/Mage/Adminhtml/Block/Cms/Page/Edit/Tab/Content.php
, in function _prepareForm()
, line 82, change:
$contentField = $fieldset->addField('content', 'editor', array( 'name' => 'content', 'style' => 'height:36em;', 'required' => true, 'disabled' => $isElementDisabled, 'config' => $wysiwygConfig ));
to
$contentField = $fieldset->addField('content', 'editor', array( 'name' => 'content', 'style' => 'height:36em;', 'required' => false, 'disabled' => $isElementDisabled, 'config' => $wysiwygConfig ));
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