Make code compatible with 5.3 :(

[MAILPOET-1279]

lib/Models/Segment.php

@@ -253,6 +253,10 @@ class Segment extends Model {
                         ->whereNull('deleted_at')
                         ->groupBy('type')
                         ->findArray();
-    return array_combine(array_column($analytics, 'type'), array_column($analytics, 'count'));
+    $result = array();
+    foreach($analytics as $segment) {
+      $result[$segment['type']] = $segment['count'];
+    }
+    return $result;
   }
 }