Log properties are not replace in artifact

[EHJ-52n]

I have downloaded the latest release from:
http://52north.org/maven/repo/releases/org/n52/sensorweb/sensorwebclient-webapp/3.3.0-rc.1/sensorwebclient-webapp-3.3.0-rc.1.war

I get the following messages in catalina.out when starting the webapp:

16:38:52,841 |-ERROR in
ch.qos.logback.core.rolling.RollingFileAppender[FILE] - Failed to create
parent directories for
[/var/lib/tomcat7/config.logger.fileappender.filepath_IS_UNDEFINED/sensorwebclient-webapp-3.3.0-rc.1.log]
16:38:52,841 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[FILE] -
openFile(config.logger.fileappender.filepath_IS_UNDEFINED/sensorwebclient-webapp-3.3.0-rc.1.log,true)
call failed. java.io.FileNotFoundException:
config.logger.fileappender.filepath_IS_UNDEFINED/sensorwebclient-webapp-3.3.0-rc.1.log
(No such file or directory)
    at java.io.FileNotFoundException:
config.logger.fileappender.filepath_IS_UNDEFINED/sensorwebclient-webapp-3.3.0-rc.1.log
(No such file or directory)
    at     at java.io.FileOutputStream.open(Native Method)
    at     at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
    at     at ch.qos.logback.core.recovery.ResilientFileOutputStream.<init>(ResilientFileOutputStream.java:28)
    at     at ch.qos.logback.core.FileAppender.openFile(FileAppender.java:149)

The logback.xmlcontains the following:

    <property name="logFile" value="${config.logger.fileappender.filepath}/sensorwebclient-webapp-3.3.0-rc.1"
/>
[...]
    <logger name="org.n52" level="${config.logger.level.org.n52}" />
    <logger name="org.n52.client" level="${config.logger.level.client}" />
    <logger name="org.n52.server" level="${config.logger.level.server}" />
[...]
    <root level="${config.logger.level}">
        <appender-ref ref="FILE" />
        <appender-ref ref="STDOUT" />
    </root>