fixing Arabic text marker, #34

Author: Intelligent2013

fop-core/src/main/java/org/apache/fop/fonts/MultiByteFont.java

@@ -678,6 +678,13 @@ private GlyphSequence mapCharsToGlyphs(CharSequence cs, List associations) {
             }
             notifyMapOperation();
             gi = findGlyphIndex(cc);
+            
+            if (gi == SingleByteEncoding.NOT_FOUND_CODE_POINT && cc == 0x061C) { // ARABIC LETTER MARK
+                //replace to ZERO-WIDTH SPACE
+                cc = 0x200B;
+                gi = findGlyphIndex(cc);
+            }
+            
             if (gi == SingleByteEncoding.NOT_FOUND_CODE_POINT) {
                 warnMissingGlyph((char) cc);
                 gi = giMissing;