minor modified input element verifying logic

src/Shared/HandyControl_Shared/Controls/Input/TimePicker.cs

@@ -408,6 +408,11 @@ namespace HandyControl.Controls
                 {
                     SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
                 }
+                else
+                {
+                    SetCurrentValue(IsErrorProperty, ValueBoxes.FalseBox);
+                    SetCurrentValue(ErrorStrProperty, default(string));
+                }
             }
             return !isError;
         }