Errors in freemarker templates are logged on SEVERE level

The problem is that SEVERE errors cannot be excluded from logging and messages like the one below fill up the disk space. The error should be properly handled by the hst and logged on a warn or info level.

Feb 7, 2013 11:10:20 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet freemarker threw exception

Error on line 6, column 5 in WEB-INF/jsp/hippo_com/home/main/content/block.ftl
document.image is undefined.
It cannot be assigned to image
The problematic instruction:
----------
==> assignment: image=document.image [on line 6, column 5 in WEB-INF/jsp/hippo_com/home/main/content/block.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Error on line 6, column 5 in WEB-INF/jsp/hippo_com/home/main/content/block.ftl
document.image is undefined.
It cannot be assigned to image
at freemarker.core.Assignment.accept(Assignment.java:111)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.process(Environment.java:199)
at freemarker.template.Template.process(Template.java:237)
at freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:452)
at freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:391)
at javax.servlet.http.HttpServlet.doHead(HttpServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.hippoecm.hst.core.container.HstComponentInvokerImpl.invokeDispatcher(HstComponentInvokerImpl.java:381)
at org.hippoecm.hst.core.container.HstComponentInvokerImpl.invokeRender(HstComponentInvokerImpl.java:186)
at sun.reflect.GeneratedMethodAccessor279.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80)
at org.hippoecm.hst.core.logging.HstComponentInvokerProfiler.profile(HstComponentInvokerProfiler.java:69)
at sun.reflect.GeneratedMethodAccessor274.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)