fixed: problems if calculated leader-length < 0

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@194078 13f79535-47bb-0310-9956-ffa450edef68

src/org/apache/fop/layout/LineArea.java

@@ -504,6 +504,12 @@ public class LineArea extends Area {
         } else if ((leaderLengthOptimum > leaderLengthMaximum) && (leaderLengthOptimum < remainingWidth)) {
             leaderLength = leaderLengthOptimum;
         }
+
+		//stop if leader-length is too small
+		if (leaderLength <= 0 ) {
+			return;
+		}
+
         switch (leaderPattern) {
             case LeaderPattern.SPACE:
                 //whitespace setting must be false for this