improved error message/handling if there's no <head> or <body> element in the editmode + removed legacy parameter blockAutoHtml

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3801 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2933) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3802 1f8fe7d8-47f0-464c-8d0a-336f4953ab05