explicit no-op layout so that layout hook gets triggered which makes API work

lib/App/Netdisco/Web/Plugin/Search/Node.pm

@@ -190,7 +190,7 @@ get '/ajax/content/search/node' => require_login sub {
           ports     => $ports,
           wireless  => $wireless,
           netbios   => $netbios,
-        }, { layout => undef };
+        }, { layout => 'noop' };
     }
     else {
         my $ports = param('deviceports')
@@ -203,7 +203,7 @@ get '/ajax/content/search/node' => require_login sub {
               ports     => $ports,
               wireless  => $wireless,
               netbios   => $netbios,
-            }, { layout => undef };
+            }, { layout => 'noop' };
         }
     }
 
@@ -248,7 +248,7 @@ get '/ajax/content/search/node' => require_login sub {
     return template 'ajax/search/node_by_ip.tt', {
       macs => $set,
       archive_filter => {@active},
-    }, { layout => undef };
+    }, { layout => 'noop' };
 };
 
 true;