Cannot Save Form or Display Templates via Dynamic Data List Display portlet

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 M4
• Fix Version/s: 7.0.0 M5
• Component/s: Dynamic Data Lists, Dynamic Data Lists > Display, Dynamic Data Lists > Form
• Labels: None
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/25263

Steps to Reproduce:

1. Add Dynamic Data List Display portlet to the Welcome page
2. Add List
3. Select "To Do" Data Definition
4. Save
5. Add Display Template or Form Template
6. Input Name
7. Save

Expected Result:
Template Saves.

Actual Result:
Portlet crashes with portal error message: "Dynamic Data Mapping is temporarily unavailable."
Console Error:

20:19:51,953 ERROR [http-bio-6080-exec-9][render_portlet_jsp:131] null
java.lang.RuntimeException: Unable to get class name from id 0
	at com.liferay.portal.util.PortalImpl.getClassName(PortalImpl.java:1547)
	at com.liferay.portal.util.PortalUtil.getClassName(PortalUtil.java:587)
	at com.liferay.portlet.dynamicdatamapping.util.DDMImpl.getDDMDisplay(DDMImpl.java:123)
	at com.liferay.portlet.dynamicdatamapping.util.DDMUtil.getDDMDisplay(DDMUtil.java:46)
	at com.liferay.portlet.dynamicdatamapping.service.impl.DDMTemplateServiceImpl.addTemplate(DDMTemplateServiceImpl.java:141)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:149)
	at com.liferay.portal.spring.transaction.DefaultTransactionExecutor.execute(DefaultTransactionExecutor.java:53)
	at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:55)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:123)
	at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:123)
	at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:123)
	at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:173)
	at com.liferay.portlet.dynamicdatamapping.service.DDMTemplateServiceUtil.addTemplate(DDMTemplateServiceUtil.java:131)
	at com.liferay.portlet.dynamicdatamapping.action.EditTemplateAction.updateTemplate(EditTemplateAction.java:341)
	at com.liferay.portlet.dynamicdatamapping.action.EditTemplateAction.processAction(EditTemplateAction.java:85)
	at com.liferay.portal.struts.PortletRequestProcessor.process(PortletRequestProcessor.java:163)
	at com.liferay.portlet.StrutsPortlet.processAction(StrutsPortlet.java:216)
	at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:71)