updated for version 7.4.477
Problem:    When using ":%diffput" and the other file is empty an extra empty
            line remains.
Solution:   Set the buf_empty flag.
diff --git a/src/diff.c b/src/diff.c
index 98b791a..d324f99 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -2325,7 +2325,7 @@
 		    end_skip = 0;
 	    }
 
-	    buf_empty = FALSE;
+	    buf_empty = bufempty();
 	    added = 0;
 	    for (i = 0; i < count; ++i)
 	    {