[New] added ListParameter.isValueEmpty()

li.strolch.model/src/main/java/li/strolch/model/parameter/ListParameter.java

@@ -47,4 +47,11 @@ public interface ListParameter<E> extends Parameter<List<E>> {
 	 * Clears the list of values
 	 */
 	public void clearValue();
+
+	/**
+	 * Returns true if the list of values is empty, false if not
+	 * 
+	 * @returns true if the list of values is empty, false if not
+	 */
+	public boolean isValueEmpty();
 }

li.strolch.model/src/main/java/li/strolch/model/parameter/StringListParameter.java

@@ -126,6 +126,11 @@ public class StringListParameter extends AbstractParameter<List<String>> impleme
 		this.value.clear();
 	}
 
+	@Override
+	public boolean isValueEmpty() {
+		return this.value.isEmpty();
+	}
+
 	@Override
 	public String getType() {
 		return TYPE;