Project Summary Panel fails to display with "tabHtml" undefined in soy template

The Project Summary Panel, ie: Projects > Overview > Summary fails to display on Version 6.2.

The stacktrace is:
com.google.template.soy.tofu.SoyTofuException: In template JIRA.Templates.Projects.projectTab: In 'print' tag, expression "$tabHtml" evaluates to undefined.
com.google.template.soy.tofu.SoyTofuException: In template JIRA.Templates.Projects.projectTab: In 'print' tag, expression "$tabHtml" evaluates to undefined.
at com.google.template.soy.tofu.internal.BaseTofu.renderMainHelper(BaseTofu.java:341)
at com.google.template.soy.tofu.internal.BaseTofu.renderMain(BaseTofu.java:300)
at com.google.template.soy.tofu.internal.BaseTofu.access$100(BaseTofu.java:56)
at com.google.template.soy.tofu.internal.BaseTofu$RendererImpl.render(BaseTofu.java:427)
at com.atlassian.soy.impl.DefaultSoyManager.render(DefaultSoyManager.java:111)
at com.atlassian.soy.impl.SoyTemplateRendererImpl.render(SoyTemplateRendererImpl.java:40)
at com.atlassian.soy.impl.SoyTemplateRendererImpl.render(SoyTemplateRendererImpl.java:33)
at com.atlassian.jira.web.dispatcher.JiraSoyViewDispatcher.dispatch(JiraSoyViewDispatcher.java:36)
at com.atlassian.jira.web.dispatcher.JiraWebworkViewDispatcher.dispatchViaSoyView(JiraWebworkViewDispatcher.java:148)
at com.atlassian.jira.web.dispatcher.JiraWebworkViewDispatcher.dispatchView(JiraWebworkViewDispatcher.java:65)
at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:204)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
[...]

After a bit of digging around, this issue probably has the same root cause as JRA-35156; as the system that the issue manifests on is running OpenJDK 7 (which I know is not a supported system). Please consider tweaking the code to fix the issue.

Cheers.