Adding content with multi-select field with no selected options throws exception

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 Beta 5
• Fix Version/s: 7.0.0 Beta 6
• Component/s: Dynamic Data Mapping
• Labels:
  • EXP7
• Fix Priority: 3
• Sprint: Sprint 10: Feb, 01 - Feb, 19
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/35308

Steps to reproduce issue:

1. Add a Web Content Structure
   • Add a 'Select' field
   • Under 'Multiple', click 'Yes'
   • Save
2. Add a template for the multi-select structure
3. Add a Web Content article using the multi-select structure and template
   • Add a title
   • Do not select any option in the multi-select field
   • Publish

Expected result: An alert is displayed, warning user that no options were selected; no console error is thrown.
Actual result: The multi-select field no longer displays after attempting to publish the article. A generic alert is thrown, and an exception is thrown at time of publishing:

22:42:00,348 ERROR [http-bio-8080-exec-10][IncludeTag:128] Current URL /group/guest/~/control_panel/manage?p_p_id=com_liferay_journal_web_portlet_JournalPortlet&p_p_lifecycle=1&p_p_state=maximized&p_p_mode=view&_com_liferay_journal_web_portlet_JournalPortlet_mvcPath=%2Fedit_article.jsp&p_p_auth=6dIqnpQE generates exception: com.liferay.portal.kernel.exception.PortalException: com.liferay.portal.kernel.template.TemplateException: Unable to process template com/liferay/dynamic/data/mapping/dependencies/alloy/option.ftl
freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:_==> field.getRenderedValue(requestedLocale, valueIndex)  [in template "com/liferay/dynamic/data/mapping/dependencies/init.ftl" at line 79, column 31]__----_Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??_----__----_FTL stack trace ("~" means nesting-related):_	- Failed at: #assign fieldValue = field.getRendere...  [in template "com/liferay/dynamic/data/mapping/dependencies/init.ftl" at line 79, column 9]_	- Reached through: #include "../init.ftl"  [in template "com/liferay/dynamic/data/mapping/dependencies/alloy/option.ftl" at line 1, column 1]_---- [Sanitized]
	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131)
	at freemarker.core.Assignment.accept(Assignment.java:136)
	at freemarker.core.Environment.visit(Environment.java:324)
	at freemarker.core.MixedContent.accept(MixedContent.java:54)
	at freemarker.core.Environment.visitByHiddingParent(Environment.java:345)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:48)
	at freemarker.core.Environment.visit(Environment.java:324)
	at freemarker.core.MixedContent.accept(MixedContent.java:54)
	at freemarker.core.Environment.visit(Environment.java:324)
	at freemarker.core.Environment.include(Environment.java:2072)
	at freemarker.core.Include.accept(Include.java:167)
	at freemarker.core.Environment.visit(Environment.java:324)
	at freemarker.core.MixedContent.accept(MixedContent.java:54)
	at freemarker.core.Environment.visit(Environment.java:324)
	at freemarker.core.Environment.process(Environment.java:302)
	at freemarker.template.Template.process(Template.java:325)
	at com.liferay.portal.template.freemarker.FreeMarkerTemplate.processTemplate(FreeMarkerTemplate.java:121)
	at com.liferay.portal.template.AbstractSingleResourceTemplate.processTemplate(AbstractSingleResourceTemplate.java:79)
	at com.liferay.dynamic.data.mapping.render.impl.DDMFormFieldFreeMarkerRenderer.processFTL(DDMFormFieldFreeMarkerRenderer.java:621)
	at com.liferay.dynamic.data.mapping.render.impl.DDMFormFieldFreeMarkerRenderer.processFTL(DDMFormFieldFreeMarkerRenderer.java:606)

Reproduced on:
Tomcat 7.0.62 + MySQL 5.6
Portal Master GIT ID: 0e77cea759507253b0d91aa660218a954db8a5c2.