EZP-26890: hiding content tree menu on error (#117)

* EZP-26890: hiding content tree menu on error
(cherry picked from commit d1f8d2336e1c430c5679337efaac42db3a5a81cf)

design/admin/templates/parts/content/menu.tpl

@@ -1,5 +1,6 @@
 <div id="content-tree">
-
+{* In case of error menu is hidden. It prevents showing content tree in case of errors i.e. module / action is disabled *}
+{if ne(module_params().module_name, 'error')}
 {* DESIGN: Header START *}<div class="box-header"><div class="box-ml">
 <h4>{'Content structure'|i18n( 'design/admin/parts/content/menu' )}</h4>
 {* DESIGN: Header END *}</div></div>
@@ -18,6 +19,7 @@
 {/if}
 
 {* DESIGN: Content END *}</div></div></div>
+{/if}
 </div>
 
 {* See parts/ini_menu.tpl and menu.ini for more info, or parts/setup/menu.tpl for full example *}