transport(output): fix high CPU usage with camera_out_enabled and no images

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed SileroVAD frame processor.
 
+- Fixed an issue where `camera_out_enabled` would cause the highg CPU usage if
+  no image was provided.
+
+
 ## [0.0.24] - 2024-05-29
 
 ### Added

src/pipecat/transports/base_output.py

@@ -252,6 +252,8 @@ class BaseOutputTransport(FrameProcessor):
                     image = next(self._camera_images)
                     self._draw_image(image)
                     time.sleep(1.0 / self._params.camera_out_framerate)
+                else:
+                    time.sleep(1.0 / self._params.camera_out_framerate)
             except queue.Empty:
                 pass
             except Exception as e: