FOP-2260: Smart quotes broken in RTF if at start of text

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1571989 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/render/rtf/rtflib/rtfdoc/RtfStringConverter.java

@@ -102,7 +102,7 @@ public final class RtfStringConverter {
             if (i != 0) {
                 d = new Character(str.charAt(i - 1));
             } else {
-                d = new Character(str.charAt(i));
+                d = new Character(SPACE);
             }
 
             //This section modified by Chris Scott