lib/dom: avoid crash on empty tags data access

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/lib/dom/dom.nit b/lib/dom/dom.nit
index 5a1b8c0..0dfee06 100644 (file)
--- a/lib/dom/dom.nit
+++ b/lib/dom/dom.nit
@@ -58,13 +58,13 @@ redef class XMLStartTag
        # var xml = code.to_xml
        # assert xml["animal"].first["tiger"].first.as(XMLStartTag).data == "This is a white tiger!"
        # ~~~
-       fun data: String
+       fun data: nullable String
        do
                for child in children do
                        if child isa PCDATA then return child.content
                        if child isa CDATA then return child.content
                end
-               abort
+               return null
        end
 end