Added just a bit more information to find out what's wrong.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@828632 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/pdf/PDFFontNonBase14.java

@@ -76,7 +76,7 @@ public abstract class PDFFontNonBase14 extends PDFFont {
         if (getDocumentSafely().getProfile().isFontEmbeddingRequired()) {
             if (this.getDescriptor().getFontFile() == null) {
                 throw new PDFConformanceException("For " + getDocumentSafely().getProfile()
-                    + ", all fonts have to be embedded!");
+                    + ", all fonts have to be embedded! Offending font: " + getBaseFont());
             }
         }
     }