intellij-community PyCharm build fails on master branch due to missing intellij.markdown module

As best I can tell, the PyCharm CE command-line build has been broken since 72d5da5a, as there is no "markdown" in "plugins", producing this build failure:

>      [java] BUILD FAILED
>      [java] /proj/jetbrains/intellij-community/build/gant.xml:48: The following modules from productProperties.productLayout.bundledPluginModules aren't found in the project: [intellij.markdown]
>      [java]
>      [java] Total time: 50 seconds
> /proj/jetbrains/intellij-community/python/build.xml:37: The following error occurred while executing this line:
> /proj/jetbrains/intellij-community/python/build.xml:21: Java returned: 1

From within IDEA, the Module Settings dialog confirms the behavior, citing:

> Module invalid item 'intellij.markdown' in the dependencies list