remove unsed tor_dir; handle FileNotFoundError; raise HTTPException on unhappy path

Author: aagbsn

ooniapi/services/ooniprobe/src/ooniprobe/routers/v1/probe_services.py

@@ -606,7 +606,6 @@ def list_tor_targets(
     settings: Settings = Depends(get_settings),
     ) -> Dict[str, TorTarget]:
 
-    tor_dir = settings.tor_targets
     token = request.headers.get("Authorization")
     if token == None:
         # XXX not actually validated
@@ -617,4 +616,6 @@ def list_tor_targets(
         return resp
     except ujson.JSONDecodeError:
         log.info("tor-targets: failed to parse json")
-        raise HTTPException(status_code=401, detail="Invalid tor-targets")
+    except FileNotFoundError
+         log.info("tor-targets: failed to open json")
+    raise HTTPException(status_code=401, detail="Invalid tor-targets")