Miscellaneous Fixes (#20951)

* ensure viewer roles are available in create user dialog

* admin-only endpoint to return unmaksed camera paths and go2rtc streams

* remove camera edit dropdown

pushing camera editing from the UI to 0.18

* clean up camera edit form

* rename component for clarity

CameraSettingsView is now CameraReviewSettingsView

* Catch case where user requsts clip for time that has no recordings

* ensure emergency cleanup also sets has_clip on overlapping events

improves https://github.com/blakeblackshear/frigate/discussions/20945

* use debug log instead of info

* update docs to recommend tmpfs

* improve display of in-progress events in explore tracking details

* improve seeking logic in tracking details

mimic the logic of DynamicVideoController

* only use ffprobe for duration to avoid blocking

fixes https://github.com/blakeblackshear/frigate/discussions/20737#discussioncomment-14999869

* Revert "only use ffprobe for duration to avoid blocking"

This reverts commit 8b15078005.

* update readme to link to object detector docs

---------

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

frigate/api/media.py

@@ -762,6 +762,15 @@ async def recording_clip(
         .order_by(Recordings.start_time.asc())
     )
 
+    if recordings.count() == 0:
+        return JSONResponse(
+            content={
+                "success": False,
+                "message": "No recordings found for the specified time range",
+            },
+            status_code=400,
+        )
+
     file_name = sanitize_filename(f"playlist_{camera_name}_{start_ts}-{end_ts}.txt")
     file_path = os.path.join(CACHE_DIR, file_name)
     with open(file_path, "w") as file: