Add predefined empty maven variables

update-poms.py

@@ -201,6 +201,8 @@ class PackagePOM:
                 value = str(self._package.version)
             elif prop.startswith('project.build') or prop.startswith('env.') or prop.startswith('maven.'):
                 value = ''
+            elif prop in ['project.basedir', 'basedir', 'user.home', 'debug.port']:
+                value = ''
             else:
                 try:
                     value = props[prop] if props is not None else self.properties[prop]