Miscellaneous fixes (0.17 beta) (#21867)

* Adjust title prompt to have less rigidity

* Improve motion boxes handling for features that don't require motion

* Improve handling of classes starting with digits

* Improve vehicle nuance

* tweak lpr docs

* Improve grammar

* Don't allow # in face name

* add password requirements to new user dialog

* change password requirements

* Clenaup

---------

Co-authored-by: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>

frigate/embeddings/maintainer.py

@@ -633,7 +633,7 @@ class EmbeddingMaintainer(threading.Thread):
 
         camera, frame_name, _, _, motion_boxes, _ = data
 
-        if not camera or len(motion_boxes) == 0 or camera not in self.config.cameras:
+        if not camera or camera not in self.config.cameras:
             return
 
         camera_config = self.config.cameras[camera]
@@ -660,8 +660,10 @@ class EmbeddingMaintainer(threading.Thread):
             return
 
         for processor in self.realtime_processors:
-            if dedicated_lpr_enabled and isinstance(
-                processor, LicensePlateRealTimeProcessor
+            if (
+                dedicated_lpr_enabled
+                and len(motion_boxes) > 0
+                and isinstance(processor, LicensePlateRealTimeProcessor)
             ):
                 processor.process_frame(camera, yuv_frame, True)