Fix deepsource issue(s)

Author: kokarare1212

librespot/audio/__init__.py

@@ -7,7 +7,7 @@
 from librespot.crypto import Packet
 from librespot.metadata import EpisodeId, PlayableId, TrackId
 from librespot.proto import Metadata_pb2 as Metadata, StorageResolve_pb2 as StorageResolve
-from librespot.structure import AudioDecrypt, AudioQualityPicker, Closeable, GeneralAudioStream, GeneralWritableStream, HaltListener, NoopAudioDecrypt, PacketsReceiver
+from librespot.structure import AudioDecrypt, AudioQualityPicker, Closeable, FeederException, GeneralAudioStream, GeneralWritableStream, HaltListener, NoopAudioDecrypt, PacketsReceiver
 import concurrent.futures
 import io
 import logging
@@ -779,7 +779,7 @@ def load_track(self, track_id_or_track: typing.Union[TrackId,
             self.logger.fatal(
                 "Couldn't find any suitable audio file, available: {}".format(
                     track.file))
-            raise
+            raise FeederException()
         return self.load_stream(file, track, None, preload, halt_listener)
 
     def pick_alternative_if_necessary(

librespot/core.py

@@ -343,10 +343,11 @@ def remove_message_listener(self, listener: MessageListener) -> None:
 
     def remove_request_listener(self, listener: RequestListener) -> None:
         with self.__request_listeners_lock:
+            request_listeners = {}
             for key, value in self.__request_listeners.items():
-                if value == listener:
-                    self.__request_listeners.pop(key)
-                    break
+                if value != listener:
+                    request_listeners[key] = value
+            self.__request_listeners = request_listeners
 
     def wait_for_listener(self) -> None:
         with self.__message_listeners_lock:

librespot/structure.py

@@ -29,6 +29,10 @@ def close(self) -> None:
         raise NotImplementedError
 
 
+class FeederException(Exception):
+    pass
+
+
 class GeneralAudioStream:
     def stream(self) -> AbsChunkedInputStream:
         raise NotImplementedError