fix issue when query filter has empty array

Author: Mh-Asmi

src/Ushahidi/Modules/V5/DTO/PostSearchFields.php

@@ -59,6 +59,11 @@ private function getParameterAsArray($parameter_value)
         if ($parameter_value) {
             if (is_array($parameter_value)) {
                 $filter_values = $parameter_value;
+                foreach ($filter_values as $key => $value) { // to handle case of passing empty value as array
+                    if (trim($value) === "") {
+                        unset($filter_values[$key]);
+                    }
+                }
             } else {
                 $filter_values = explode(',', $parameter_value);
             }