Fix saving resources when Date TV has no input properties (modxcms#16652)

### What does it do?
Check if tvProperties is an array

### Why is it needed?
Issue: BUG-16651

### How to test
Create a new Date TV without any input properties and test if you can
save a paege.

### Related issue(s)/PR(s)
 BUG-16651

Author: MrRoco

core/src/Revolution/Processors/Resource/Create.php

@@ -510,7 +510,7 @@ public function addTemplateVariables()
                         $tvProperties = $tv->get('input_properties');
                         if (!empty($value)) {
                             $dateTime = new \DateTime($value);
-                            if (array_key_exists('hideTime', $tvProperties) && (bool)$tvProperties['hideTime'] && $tvProperties['hideTime'] != 'false') {
+                            if (is_array($tvProperties) && array_key_exists('hideTime', $tvProperties) && (bool)$tvProperties['hideTime'] && $tvProperties['hideTime'] != 'false') {
                                 $dateTime->setTime(0, 0, 0, 0);
                             }
                             $value = $dateTime->format('Y-m-d H:i:s');

core/src/Revolution/Processors/Resource/Update.php

@@ -748,7 +748,7 @@ public function saveTemplateVariables()
                         $tvProperties = $tv->get('input_properties');
                         if (!empty($value)) {
                             $dateTime = new \DateTime($value);
-                            if (array_key_exists('hideTime', $tvProperties) && (bool)$tvProperties['hideTime'] && $tvProperties['hideTime'] != 'false') {
+                            if (is_array($tvProperties) && array_key_exists('hideTime', $tvProperties) && (bool)$tvProperties['hideTime'] && $tvProperties['hideTime'] != 'false') {
                                 $dateTime->setTime(0, 0, 0, 0);
                             }
                             $value = $dateTime->format('Y-m-d H:i:s');