SQL DAL Maker plugin does not recognize its own data nodes after reactivation

SQL DAL Maker plugin (http://plugins.netbeans.org/plugin/73614) for some reason does recognize *.dal files when activated after being deactive and perhaps same issue occurs when re-installed.

Steps to reproduce:

1. Download 1556400791_com-sqldalmaker-netbeans.nbm file [1]
2. Go to Tools > Plugins > Download, click Add Plugins... button and instal it.
3. Create new Java sample project and then new empty java.dal file via Ctrl+N.
4. It is opened in Editor with DTO, DAO and Admin tabs.
5. Go to Tools > Plugins > Installed, uncheck Show details option, select SQL DAL Maker plugin and deactivate it.
6. After restart reactivate the plugin in a similar way.

[1] http://plugins.netbeans.org/download/plugin/10010

Expected result: The java.dal file is recognized and DTO, DAO and Admin tabs in Editor are displayed when opening java.dal file.

Actual result: NetBeans treats java.dal file as a plain text file and shows only empty editor without any additional tabs. Workaround is to restart the IDE.