Refactoring without changing logic, so I can understand the code

1 files changed, 2 insertions, 2 deletions

diff --git a/core/Segment/SegmentExpression.php b/core/Segment/SegmentExpression.php
index 4078321ce0..10cf0294e3 100644
--- a/core/Segment/SegmentExpression.php
+++ b/core/Segment/SegmentExpression.php
@@ -48,7 +48,7 @@ class SegmentExpression
 
     public function isEmpty()
     {
-        return empty($this->string);
+        return count($this->tree) == 0;
     }
 
     protected $joins = array();
@@ -342,7 +342,7 @@ class SegmentExpression
      */
     public function getSql()
     {
-        if (count($this->tree) == 0) {
+        if ($this->isEmpty()) {
             throw new Exception("Invalid segment, please specify a valid segment.");
         }
         $sql = '';