Issue #3387673 - Fix filter

Closes #3387673

src/Plugin/views/filter/ViewsJsonFilter.php

@@ -231,11 +231,19 @@ class ViewsJsonFilter extends FilterPluginBase {
    * Generate the filter criteria.
    */
   public function generate() {
+    $options = $this->options;
+
     $operator = $this->options['operator'];
-    $key = $this->options['key'];
-    $value = !empty($this->value) && $this->isExposed() ? reset($this->value) : $this->options['value'];
+    if ($options['exposed'] && $options['expose']['use_operator']) {
+      $operator = $this->operator;
+    }
+
+    $value = $this->options['value'];
+    if ($options['exposed'] && !empty($this->value)) {
+      $value = $options['expose']['multiple'] ? $this->value : reset($this->value);
+    }
 
-    return [$key, $operator, $value];
+    return !empty($value) ? [$this->options['key'], $operator, $value] : [];
   }
 
 }