Handle missing zoom translation gracefully in RelativeMove

When a camera reports zoom-r support but the zeep move request
object lacks a Zoom translation attribute, fall back to sending
pan/tilt only instead of crashing silently. This allows the ONVIF
proxy to handle zoom separately via digital zoom.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frigate/ptz/onvif.py

@@ -542,6 +542,7 @@ class OnvifController:
                 == ZoomingModeEnum.relative
             )
         ):
+            try:
                 move_request.Speed = {
                     "PanTilt": {
                         "x": speed,
@@ -550,6 +551,16 @@ class OnvifController:
                     "Zoom": {"x": speed},
                 }
                 move_request.Translation.Zoom.x = zoom
+            except (AttributeError, KeyError):
+                logger.warning(
+                    f"{camera_name}: zoom translation not available, sending pan/tilt only"
+                )
+                move_request.Speed = {
+                    "PanTilt": {
+                        "x": speed,
+                        "y": speed,
+                    },
+                }
         else:
             move_request.Speed = {
                 "PanTilt": {