[librsvg/librsvg-2.44] paint_server.rs: Log when there is a nonexistent pattern with no alternate

[Federico Mena Quintero <federico src gnome org>]

commit a02c43e59190ce480454af01be31d3a761fa3a20
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Oct 24 11:44:11 2018 -0500

    paint_server.rs: Log when there is a nonexistent pattern with no alternate

 rsvg_internals/src/paint_server.rs | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/rsvg_internals/src/paint_server.rs b/rsvg_internals/src/paint_server.rs
index 7e8f25a6..83c531d7 100644
--- a/rsvg_internals/src/paint_server.rs
+++ b/rsvg_internals/src/paint_server.rs
@@ -108,6 +108,11 @@ pub fn set_source_paint_server(
                     current_color,
                 );
                 had_paint_server = true;
+            } else {
+                rsvg_log!(
+                    "pattern \"{}\" was not found and there was no fallback alternate",
+                    iri
+                );
             }
         }