Set a Maven Property indicating if a database reused or created.

This feature can be useful to control the behaviour of subsequent Maven steps. For example, if a database is filled with default data, a user might want to skip this step if an existing database was reused. See “example-database-reuse.apt.vm” for an example.
what is the point to continue here? let's either throw a runtime exception or do the next block only if `this.project != null`