Fix --use-nan-for-all-missing-data

- Fixes: https://github.com/oetiker/rrdtool-1.x/issues/918

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index 5a78f573d9f16249126446c771c850ca0c6ecea1..f5d2cdec5713d4213282e8e2333adc7173eb02d8 100644 (file)
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -1072,7 +1072,7 @@ int data_fetch(
                 im->gdes[i].ds = ii;
             }
         }
-        if (im->gdes[i].ds == -1) {
+        if ((im->gdes[i].ds == -1) && !(im->extra_flags & ALLOW_MISSING_DS)) {
             rrd_set_error("No DS called '%s' in '%s'",
                           im->gdes[i].ds_nam, im->gdes[i].rrd);
             return -1;