Eclipse (m2e) throws NullPointerException erros due to a missing property in the pom.xml file

Steps to reproduce:
1. Import Opencast 2.0 in as an Eclipse project with m2e
2.
3.

Actual Results:
Eclipse throws a NullPointerException when it tries to load several submodules as projects, namely matterhorn-admin-ui-ng and some others

Expected Results:
The projects should be imported without errors

Workaround (if any):
The parameter <versionRange> should be added to the <pluginExecution> section of the frontend-maven-plugin in the <pluginManagement> section of the main pom.xml