Prevent undefined index errors

uw_ct_event.module

@@ -33,7 +33,7 @@ function uw_ct_event_preprocess_node(&$vars) {
 
       // If there is a summary remove the images from it and set variable.
       if ($body['summary'] !== '') {
-        $vars['content']['body_to_display'] = _uw_ct_event_remove_images_from_text($body['safe_summary']);
+        $vars['content']['body_to_display'] = _uw_ct_event_remove_images_from_text(isset($body['safe_summary']) ? $body['safe_summary'] : NULL);
       }
       // If there is a value in the body remove
       // the images from it and set variable.
@@ -73,14 +73,14 @@ function uw_ct_event_preprocess_node(&$vars) {
 
           // Get the entity wrapper for the individual event node.
           // This is required to get the timezone.
-          $event_wrapper = entity_metadata_wrapper('node', $vars['view']->result[$vars['id'] - 1]->nid);
+          $event_wrapper = isset($vars['view']) ? entity_metadata_wrapper('node', $vars['view']->result[$vars['id'] - 1]->nid) : NULL;
 
           // Replace the two date values from the view results
           // into the 0th element of field_event_date.
           // Also, add in the timezone.
           $event_date = array(
-            'value' => $vars['view']->result[$vars['id'] - 1]->field_data_field_event_date_field_event_date_value,
-            'value2' => $vars['view']->result[$vars['id'] - 1]->field_data_field_event_date_field_event_date_value2,
+            'value' => isset($vars['view']) ? $vars['view']->result[$vars['id'] - 1]->field_data_field_event_date_field_event_date_value : NULL,
+            'value2' => isset($vars['view']) ? $vars['view']->result[$vars['id'] - 1]->field_data_field_event_date_field_event_date_value2 : NULL,
             'timezone' => $event_wrapper->field_event_date->value()[0]['timezone'],
             'timezone_db' => $event_wrapper->field_event_date->value()[0]['timezone_db'],
           );
@@ -92,10 +92,10 @@ function uw_ct_event_preprocess_node(&$vars) {
           $vars['content']['output'] = field_view_value('node', $node, $field_name, $event_date, $display);
 
           // Drop the re-occuring rule if it is present.
-          $vars['content']['output']['#markup'] = preg_replace('/\<div class=\"date-repeat-rule\"\>(.*?)\<\/div\>/', '', $vars['content']['output']['#markup']);
+          $vars['content']['output']['#markup'] = preg_replace('/\<div class=\"date-repeat-rule\"\>(.*?)\<\/div\>/', '', isset($vars['view']) ? $vars['content']['output']['#markup'] : NULL);
 
           // Remove the second end date if over multiple dates.
-          $vars['content']['output']['#markup'] = preg_replace('/ to <span.*?<\/span>/', '', $vars['content']['output']['#markup']);
+          $vars['content']['output']['#markup'] = preg_replace('/ to <span.*?<\/span>/', '', isset($vars['view']) ? $vars['content']['output']['#markup'] : NULL);
         }
       }
     }