Convert: do not block if the $error is a boolean

src/Convert.php

@@ -60,7 +60,12 @@ class Convert
             return $inputDate;
         }
         $errors = $date->getLastErrors();
-        if ($errors["warning_count"] > 0 || $errors["error_count"] > 0) {
+        if (
+            $errors !== false && (
+                $errors["warning_count"] > 0 ||
+                $errors["error_count"] > 0
+            )
+        ) {
             if ($exception === true) {
                 throw new \Exception(
                     "Invalid date provided or not matching the format",