[REF] switch from (undeclared) class property to local variable.

We either needed to declare the variable on the class & make it a local variable. Switching
to a local var reflects the fact it is never accessed from outside thie function & improves readability.

grepping for _userOptions returns nothing after this.

I also removed an extraneous config singleton call. I can't see a strong case that either of
these changes will affect the intermittent fails but ... maybe?

CRM/Contact/Page/View/UserDashBoard.php

@@ -115,10 +115,9 @@ public function preProcess() {
    */
   public function buildUserDashBoard() {
     //build component selectors
-    $dashboardElements = array();
-    $config = CRM_Core_Config::singleton();
+    $dashboardElements = [];
 
-    $this->_userOptions = CRM_Core_BAO_Setting::valueOptions(CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME,
+    $dashboardOptions = CRM_Core_BAO_Setting::valueOptions(CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME,
       'user_dashboard_options'
     );
 
@@ -130,7 +129,7 @@ public function buildUserDashBoard() {
         continue;
       }
 
-      if (!empty($this->_userOptions[$name]) &&
+      if (!empty($dashboardOptions[$name]) &&
         (CRM_Core_Permission::access($component->name) ||
           CRM_Core_Permission::check($elem['perm'][0])
         )
@@ -148,7 +147,7 @@ public function buildUserDashBoard() {
     }
 
     // CRM-16512 - Hide related contact table if user lacks permission to view self
-    if (!empty($this->_userOptions['Permissioned Orgs']) && CRM_Core_Permission::check('view my contact')) {
+    if (!empty($dashboardOptions['Permissioned Orgs']) && CRM_Core_Permission::check('view my contact')) {
       $dashboardElements[] = array(
         'class' => 'crm-dashboard-permissionedOrgs',
         'templatePath' => 'CRM/Contact/Page/View/RelationshipSelector.tpl',
@@ -158,7 +157,7 @@ public function buildUserDashBoard() {
 
     }
 
-    if (!empty($this->_userOptions['PCP'])) {
+    if (!empty($dashboardOptions['PCP'])) {
       $dashboardElements[] = array(
         'class' => 'crm-dashboard-pcp',
         'templatePath' => 'CRM/Contribute/Page/PcpUserDashboard.tpl',
@@ -170,7 +169,7 @@ public function buildUserDashBoard() {
       $this->assign('pcpInfo', $pcpInfo);
     }
 
-    if (!empty($this->_userOptions['Assigned Activities']) && empty($this->_isChecksumUser)) {
+    if (!empty($dashboardOptions['Assigned Activities']) && empty($this->_isChecksumUser)) {
       // Assigned Activities section
       $dashboardElements[] = array(
         'class' => 'crm-dashboard-assignedActivities',
@@ -186,9 +185,9 @@ public function buildUserDashBoard() {
     $this->assign('dashboardElements', $dashboardElements);
 
     // return true when 'Invoices / Credit Notes' checkbox is checked
-    $this->assign('invoices', $this->_userOptions['Invoices / Credit Notes']);
+    $this->assign('invoices', $dashboardOptions['Invoices / Credit Notes']);
 
-    if (!empty($this->_userOptions['Groups'])) {
+    if (!empty($dashboardOptions['Groups'])) {
       $this->assign('showGroup', TRUE);
       //build group selector
       $gContact = new CRM_Contact_Page_View_UserDashBoard_GroupContact();