Org reader: allow figure with empty caption

A `#+CAPTION` attribute before an image is enough to turn an image into a
figure. This wasn't the case because the `parseFromString` function, which
processes the caption value, would fail on empty values. Adding a newline
character to the caption value fixes this.

Fixes: #3161

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/Tests/Readers/Org.hs b/tests/Tests/Readers/Org.hs
index 49423bd11..3eab710dc 100644
--- a/tests/Tests/Readers/Org.hs
+++ b/tests/Tests/Readers/Org.hs
@@ -916,6 +916,12 @@ tests =
                     ] =?>
             let attr = ("fig:myfig", mempty, mempty)
             in para (imageWith attr "blub.png" "fig:" "My figure")
+
+        , "Figure with empty caption" =:
+            unlines [ "#+CAPTION:"
+                    , "[[file:guess.jpg]]"
+                    ] =?>
+            para (image "guess.jpg" "fig:" "")
         ]
 
       , "Footnote" =: