Issue #572 - discard an all space text node.

An earlier patch now passes back an all space text node. Previously this
would have been skipped. So add code in ParseList to detect, and discard
such a node.

Change committed:
	modified:   src/parser.c

src/parser.c

@@ -2475,6 +2475,21 @@ void TY_(ParseList)(TidyDocImpl* doc, Node *list, GetTokenMode ARG_UNUSED(mode))
             TY_(FreeNode)( doc, node);
             continue;
         }
+        if (lexer && (node->type == TextNode))
+        {
+            uint ch, ix = node->start;
+            /* Issue #572 - Skip whitespace. */
+            while (ix < node->end && (ch = (lexer->lexbuf[ix] & 0xff))
+                && (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n'))
+                ++ix;
+            if (ix >= node->end)
+            {
+                /* Issue #572 - Discard if ALL whitespace. */
+                TY_(FreeNode)(doc, node);
+                continue;
+            }
+        }
+
 
         /* 
           if this is the end tag for an ancestor element