=== modified file 'cmd/tools/dot2gxl.c'
--- cmd/tools/dot2gxl.c	2009-05-14 10:09:18 +0000
+++ cmd/tools/dot2gxl.c	2009-05-14 10:12:11 +0000
@@ -646,7 +646,7 @@
     char *val;
 
     val = agget(e, name);
-    if (val[0]) {
+    if (val != NULL) {
 	tabover(gxlFile);
 	fprintf(gxlFile, "\t<attr name=\"%s\">\n", name);
 	tabover(gxlFile);