editor_new = CKEDITOR.appendTo( 'editorSpace',{
                on:{
                    instanceReady: function(ev){
                        this.dataProcessor.writer.lineBreakChars = '';
                        this.dataProcessor.writer.setRules( 'p', {
                            indent: false,
                            breakBeforeOpen: false,
                            breakAfterOpen: false,
                            breakBeforeClose: false,
                            breakAfterClose: false
        });

<p>Tony</p>

<p>&nbsp;</p>

<p>Stark</p>

<p>Tony</p>
<p>&nbsp;</p>
<p>Stark</p>

<p>Tony</p><p>&nbsp;</p><p>Stark</p>

CKEDITOR.replace( 'editor', {
    removePlugins: 'htmlwriter'
} );