fix keeping cache of broken zip

tvdb_api.py

@@ -536,6 +536,8 @@ def _loadUrl(self, url, recache = False, language=None):
                 myzipfile = zipfile.ZipFile(zipdata)
                 return myzipfile.read('%s.xml' % language)
             except zipfile.BadZipfile:
+                if 'x-local-cache' in resp.headers:
+                    resp.delete_cache()
                 raise tvdb_error("Bad zip file received from thetvdb.com, could not read it")
 
         return resp.read()

tvdb_cache.py

@@ -87,6 +87,20 @@ def store_in_cache(cache_location, url, response):
         return True
     else:
         return False
+
+@locked_function
+def delete_from_cache(cache_location, url):
+    """Deletes a response in cache."""
+    hpath, bpath = calculate_cache_path(cache_location, url)
+    try:
+        if os.path.exists(hpath):
+            os.remove(hpath)
+        if os.path.exists(bpath):
+            os.remove(bpath)
+    except IOError:
+        return True
+    else:
+        return False
 
 class CacheHandler(urllib2.BaseHandler):
     """Stores responses in a persistant on-disk cache.
@@ -197,6 +211,13 @@ def recache(self):
         )
         CachedResponse.__init__(self, self.cache_location, self.url, True)
 
+    @locked_function
+    def delete_cache(self):
+        delete_from_cache(
+            self.cache_location,
+            self.url
+        )
+
 
 if __name__ == "__main__":
     def main():