Dashboard: hide Cache devices if not present

plugins/dynamix/DashStats.page

@@ -45,6 +45,7 @@ $dockerd = pgrep('dockerd');
 $libvirtd = pgrep('libvirtd');
 $apcupsd = file_exists('/var/run/apcupsd.pid');
 $started = $var['fsState']=='Started';
+$cache_pool = $var['cacheSbNumDisks'];
 $array_size = $array_used = 0;
 $cache_size = $cache_used = 0;
 $extra_size = $extra_used = 0;
@@ -255,7 +256,7 @@ foreach ($ports as $port) {
 </td><td></td></tr>
 </tbody>
 <?endif;?>
-<?if ($fans>0):?>
+<?if ($fans):?>
 <tbody>
 <tr><td></td><td colspan='3' class='next'><i class='icon-fan'></i><div class='section'>Airflow<br><span>Fan count: <?=$fans?></span><br><br></div>
 <i class='fa blue-text chevron' id='fan_view' onclick='toggleChevron("fan_view",0)'></i></td><td></td></tr>
@@ -429,7 +430,7 @@ foreach ($users as $user) {
 <tr id='array_view_on' style='display:none'><td></td><td>Device</td><td>Status</td><td>Temp</td><td>SMART</td><td>Utilization</td><td></td></tr>
 </thead>
 <tbody class='array_view' id='array_list' style='display:none'></tbody>
-<?if (isset($disks['cache'])):?>
+<?if ($cache_pool):?>
 <thead><tr><td></td><td colspan='5' class='next'>Cache<?if (!$started):?> (not started)<?endif;?><i class='fa blue-text chevron mt0' id='cache_view' onclick='toggleChevron("cache_view",0)'></i>
 <?if ($started):?><span class='info'><?=my_scale($cache_used*1024,$unit)." $unit"?> used of <?=my_scale($cache_size*1024,$unit,-1,-1)." $unit"?> (<?=$cache_percent?> %)</span><?endif;?>
 </td><td></td></tr>
@@ -560,7 +561,7 @@ function moreInfo(data,table) {
   return info.length ? "<div style='padding-bottom:12px'><i class='icon-u-triangle failed'></i><span class='failed'>"+table+" has "+info.join('. ')+".</span></div>" : "";
 }
 function update5() {
-<?if ($fans>0):?>
+<?if ($fans):?>
   $.post('<?=$url?>',{cmd:'fan'},function(data) {
     $.each(data.split('\0'),function(k,v) {$('#fan'+k).html(v);});
   });
@@ -774,7 +775,7 @@ $(function() {
   toggleView('cpu_view',true);
   toggleView('mem_view',true);
   toggleView('port_view',true);
-<?if ($fans>0):?>
+<?if ($fans):?>
   toggleView('fan_view',true);
 <?endif;?>
 <?if ($apcupsd):?>
@@ -788,7 +789,9 @@ $(function() {
 <?endif;?>
   toggleView('parity_view',true);
   toggleView('array_view',true);
+<?if ($cache_pool):?>
   toggleView('cache_view',true);
+<?endif;?>
 <?if ($devs):?>
   toggleView('extra_view',true);
 <?endif;?>