[librsvg/librsvg-2.42] yield the identity transform for empty transform attribute

[Federico Mena Quintero <federico src gnome org>]

commit 174929f5457b832418a2ccb6a04c2f053c5769c9
Author: Dmitry Kontsevoy <dmitry kontsevoy gmail com>
Date:   Thu Mar 15 00:24:36 2018 +0300

    yield the identity transform for empty transform attribute

 rsvg_internals/src/transform.rs | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/rsvg_internals/src/transform.rs b/rsvg_internals/src/transform.rs
index 2ba8f40a..12364901 100644
--- a/rsvg_internals/src/transform.rs
+++ b/rsvg_internals/src/transform.rs
@@ -41,13 +41,13 @@ fn parse_transform_list(s: &str) -> Result<cairo::Matrix, AttributeError> {
     let mut matrix = cairo::Matrix::identity();
 
     loop {
-        let m = parse_transform_command(&mut parser)?;
-        matrix = cairo::Matrix::multiply(&m, &matrix);
-
         if parser.is_exhausted() {
             break;
         }
 
+        let m = parse_transform_command(&mut parser)?;
+        matrix = cairo::Matrix::multiply(&m, &matrix);
+
         optional_comma(&mut parser);
     }
 
@@ -418,4 +418,9 @@ mod parser_tests {
             cairo::Matrix::multiply(&r, &a)
         );
     }
+
+    #[test]
+    fn parses_empty() {
+        assert_eq!(parse_transform("").unwrap(), cairo::Matrix::identity());
+    }
 }