Correctly handle exceptions when loading podcasts to prevent one fail…

…ing load breaking the whole import.

lib/services/podcast/mobile_opml_service.dart

@@ -64,7 +64,7 @@ class MobileOPMLService extends OPMLService {
           if (result != null) {
             await podcastService.subscribe(result);
           }
-        } on Exception {
+        } catch (e) {
           log.fine('Failed to load podcast ${p.xmlUrl}');
         }
       }