An error JS occures when the embed image has an "alignment" and no "class".

The JS error is :

TypeError: args.class is null
args['class'] = args['class'].replace( /ezoeAlign\w+/, '' );

You can fix the issue in :
/extension/ezoe/design/standard/templates/ezoe/tag_embed_images.tpl, line 62 :
if ( args['align'] )
becomes
if ( args['align'] && args['class'] )

Steps to reproduce

Add an embed image in the OE. Set an alignment, don't set any class, and press ok.