When using the {content_module} tag calling a module that is not installed the
following error shows up when you edit a page:
 
Fatal error: Cannot break/continue 1 level in
/lib/classes/contenttypes/Content.inc.php on line 793

This is because in the function _display_module_block() it says

if( !is_object($module) ) continue;

This might be an ancient relict when all the content blocks were processed in a
foreach loop. But now there is no loop anymore. So it should be just a 'return'
instead of 'continue' (or maybe a message, that the module could not be found).

This issue is also in CMSms 1.11 SVN rev 7824