PDFBOX-6064: avoid exception

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1928309 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdfparser/PDFStreamParser.java

@@ -270,15 +270,16 @@ else if( next.equals( "false" ) )
                         if (imageData.getImageData() == null || imageData.getImageData().length == 0)
                         {
                             LOG.warn("empty inline image at stream offset {}",
-                                    source.getPosition());
+                                    (source.isClosed() ? "EOF" : source.getPosition()));
                         }
                         beginImageOP.setImageData(imageData.getImageData());
                         inlineImageDepth--;
                     }
                     else
                     {
                         LOG.warn("nextToken {} at position {}, expected {}?!", 
-                                nextToken, source.getPosition(), OperatorName.BEGIN_INLINE_IMAGE_DATA);
+                                nextToken, (source.isClosed() ? "EOF" : source.getPosition()), 
+                                OperatorName.BEGIN_INLINE_IMAGE_DATA);
                     }
                 }
                 return beginImageOP;