Empty line check inserted.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271593 13f79535-47bb-0310-9956-ffa450edef68

proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters/LineContains.java

@@ -157,7 +157,6 @@ public final class LineContains
                 for (int i = 0; i < containsSize; i++) {
                     String containsStr = (String) contains.elementAt(i);
                     if (line.indexOf(containsStr) == -1) {
-                        System.out.println("Hello");
                         line = null;
                         break;
                     }

proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters/PrefixLines.java

@@ -127,12 +127,15 @@ public final class PrefixLines
 
         int ch = -1;
 
+        if (queuedData != null && queuedData.length() == 0) {
+            queuedData = null;
+        }
+
         if (queuedData != null) {
+            ch = queuedData.charAt(0);
+            queuedData = queuedData.substring(1);
             if (queuedData.length() == 0) {
                 queuedData = null;
-            } else {
-                ch = queuedData.charAt(0);
-                queuedData = queuedData.substring(1);
             }
         } else {
             ch = in.read();