fixes a crash with data:image/svg+xml links

CHANGELOG

@@ -13,6 +13,7 @@ Changes since beta1
 - fixes opening mailto links
 - fixes existing non-html ressources marked a to_fetch even when not needed (simple and/or confusion)
 - fixes a crash with RSS feeds without <link> element
+- fixes a crash with data:image/svg+xml links
 - fixes a bug in HTML renderer where some hX element were not closed properly
 - fixes input in Gemini while online
 - fixes a crash with invalid URL

offutils.py

@@ -146,7 +146,8 @@ def looks_like_base64(src,baseurl):
             imgurl = urllib.parse.urljoin(baseurl, imgname)
         else:
             #We can’t handle other data:image such as svg for now
-            imgurl = None
+            #Url cannot be none so set to the base URL
+            imgurl = urllib.parse.urljoin(baseurl,"offpunk_does_not_support_inline.svg")
     else:
         imgurl = urllib.parse.urljoin(baseurl, imgname)
     return imgurl,imgdata