Merge pull request #325 from zopefoundation/fix_breadcrumbs

fix breadcrumbs if there is no title

src/App/dtml/manage_tabs.dtml

@@ -42,7 +42,7 @@
 
 		<nav aria-label="breadcrumb">
 		<dtml-let breadcrumb_length="len(list(tabs_path_default(REQUEST)))">
-			<ol class="breadcrumb <dtml-var "'zmi-' + title.replace(' ','')">" 
+			<ol class="breadcrumb <dtml-var "'zmi-' + title_or_id().replace(' ','')">"
 				data-length="<dtml-var breadcrumb_length>">
 				<li class="breadcrumb-item meta_type">
 					<dtml-if meta_type>
@@ -69,7 +69,7 @@
 							&nbsp;/&nbsp;
 						</dtml-if>
 						<dtml-if wl_isLocked
-							><span class="badge badge-warning" 
+							><span class="badge badge-warning"
 								title="This item has been locked by WebDAV"><i class="fa fa-lock"></i></span>
 						</dtml-if>
 					</li>