check for header and trailer

Author: chrjohn

quickfixj-base/src/main/java/quickfix/DataDictionary.java

@@ -1155,6 +1155,7 @@ private void load(InputStream inputStream, DocumentBuilderFactory factory) throw
     private int getIntegerAttributeIfDefined(final Element documentElement, final String attribute) throws ConfigError {
         try {
             return documentElement.hasAttribute(attribute)
+                    // TODO
                     ? Integer.valueOf(documentElement.getAttribute(attribute)) : 0;
         } catch (NumberFormatException e) {
             throw new ConfigError("Attribute " + attribute + " could not be parsed as Integer.", e);
@@ -1168,6 +1169,11 @@ public int getNumMessageCategories() {
     private void load(Document document, String msgtype, Node node) throws ConfigError {
         String name;
         final NodeList fieldNodes = node.getChildNodes();
+
+        if (countElementNodes(fieldNodes) == 0 && (msgtype == HEADER_ID || msgtype == TRAILER_ID)) {
+            throw new ConfigError("No fields found: msgType=" + msgtype);
+        }
+
         for (int j = 0; j < fieldNodes.getLength(); j++) {
             final Node fieldNode = fieldNodes.item(j);