fix crash when feedparser is crashing on a bad RSS

CHANGELOG

@@ -4,6 +4,7 @@
 - offpunk/netcache: fix IPv6 as an URL (bug #40)
 - ansicat: display empty files (instead of opening them with xdg-open)
 - fix escape sequence warning in python 3.12 (by Étienne Mollier) (Debian #1064209)
+- ansicat : fix crash when feedparser is crashing on bad RSS
 
 ## 2.2 - February 13th 2023
 - cache folder is now configurable through $OFFPUNK_CACHE_PATH environment variable (by prx)

ansicat.py

@@ -877,10 +877,15 @@ class FeedRenderer(GemtextRenderer):
         return "application/rss+xml"
     def is_valid(self):
         if _DO_FEED:
-            parsed = feedparser.parse(self.body)
+            try:
+                parsed = feedparser.parse(self.body)
+            except:
+                parsed = False
         else:
             return False
-        if parsed.bozo:
+        if not parsed:
+            return False
+        elif parsed.bozo:
             return False
         else:
             #If no content, then fallback to HTML