The simulator should not crash, when no metric is defined. Instead, log a WARNING.

src/de/tud/kom/p2psim/impl/analyzer/metric/filter/AbstractFilter.java

@@ -24,6 +24,8 @@ import java.util.LinkedList;
 import java.util.List;
 
 import de.tudarmstadt.maki.simonstrator.api.Host;
+import de.tudarmstadt.maki.simonstrator.api.Monitor;
+import de.tudarmstadt.maki.simonstrator.api.Monitor.Level;
 import de.tudarmstadt.maki.simonstrator.api.common.metric.AbstractMetric;
 import de.tudarmstadt.maki.simonstrator.api.common.metric.ActiveMetric;
 import de.tudarmstadt.maki.simonstrator.api.common.metric.ActiveMetric.ActiveMetricListener;
@@ -97,9 +99,13 @@ public abstract class AbstractFilter<M extends MetricValue<?>>
 			incomingMetrics.add(metric);
 		}
 		if (incomingMetrics.isEmpty()) {
-			throw new AssertionError(
-					"["+this.getName()+"] No incoming metrics configured! Available metrics are: "
+			
+			Monitor.log(getClass(), Level.WARN, "["+this.getName()+"] No incoming metrics configured! Available metrics are: "
+					+ metrics.toString(), this);
+			
+			System.err.println("["+this.getName()+"] No incoming metrics configured! Available metrics are: "
 							+ metrics.toString() );
+			return;
 		}
 
 		onInitialize(incomingMetrics);