Fix counting of non-countable versions for PHP 7.2

Update sfFormField.class.php
Update sfFormField.class.php
remove null !== $this->error
fix by e1himself
Update sfFormField.class.php

test travis

Author: vitaliytv

lib/form/sfFormField.class.php

@@ -324,6 +324,10 @@ public function getError()
    */
   public function hasError()
   {
-    return null !== $this->error && count($this->error);
+    if ($this->error instanceof sfValidatorErrorSchema) {
+      return $this->error->count() > 0;
+    }
+    
+    return $this->error !== null;
   }
 }