Explicitly ensure the rows property is populated even if no queries are processed after filtering out admin bar queries.

Author: johnbillion

collectors/db_queries.php

@@ -117,6 +117,8 @@ public function process_db_object() {
 			return;
 		}
 
+		$this->data->rows = array();
+
 		$types = array();
 		$total_time = 0;
 		$has_result = false;
@@ -236,7 +238,7 @@ public function process_db_object() {
 			'is_main_query' => true,
 		) );
 
-		$this->data->total_qs = count( (array) $this->data->rows );
+		$this->data->total_qs = count( $this->data->rows );
 		$this->data->total_time = $total_time;
 		$this->data->has_result = $has_result;
 		$this->data->has_trace = $has_trace;