Broaden session validation exception handling

Due to how instances installed with pip seem to have issues storing
unrelated files in the same directory as sessions, exception handling
during session validation has been expanded to blindly ignore all
exceptions. This portion of the code is more for maintainers of large
public instances with a bunch of users who block cookies anyways, so
having basic app functionality break down as a result shouldn't be the
default.

app/routes.py

@@ -85,7 +85,10 @@ def session_required(f):
                     if isinstance(data, dict) and 'valid' in data:
                         continue
                     invalid_sessions.append(file_path)
-            except (EOFError, FileNotFoundError, pickle.UnpicklingError):
+            except Exception:
+                # Broad exception handling here due to how instances installed
+                # with pip seem to have issues storing unrelated files in the
+                # same directory as sessions
                 pass
 
         for invalid_session in invalid_sessions: