OO-4209: real null in OpenMeetings Module (patch S. Clemenz)

src/main/java/org/olat/modules/openmeetings/OpenMeetingsModule.java

@@ -61,7 +61,7 @@ public class OpenMeetingsModule  extends AbstractSpringModule implements ConfigO
 	private String adminLogin;
 	@Value("${vc.openmeetings.adminpassword}")
 	private String adminPassword;
-	@Value("${vc.openmeetings.supportemail:null}")
+	@Value("${vc.openmeetings.supportemail:#{null}}")
 	private String supportEmail;