Enables viewport when livestreaming is enabled (#336)

# Description

Ensures that a viewport is available when `--livestream/LIVESTREAM > 0`
in AppLauncher. See [this
PR](isaac-orbit/IsaacLab#310) for more details.

## Type of change

- Bug fix (non-breaking change which fixes an issue)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./orbit.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

source/extensions/omni.isaac.orbit/config/extension.toml

@@ -1,7 +1,7 @@
 [package]
 
 # Note: Semantic Versioning is used: https://semver.org/
-version = "0.10.9"
+version = "0.10.10"
 
 # Description
 title = "ORBIT framework for Robot Learning"

source/extensions/omni.isaac.orbit/docs/CHANGELOG.rst

@@ -1,6 +1,16 @@
 Changelog
 ---------
 
+0.10.10 (2023-12-21)
+~~~~~~~~~~~~~~~~~~~~
+
+Fixed
+^^^^^
+
+* Fixed reliance on non-existent ``Viewport`` in :class:`omni.isaac.orbit.sim.SimulationContext` when loading livestreaming
+  by ensuring that the extension ``omni.kit.viewport.window`` is enabled in :class:`omni.isaac.orbit.app.AppLauncher` when
+  livestreaming is enabled
+
 0.10.9 (2023-12-21)
 ~~~~~~~~~~~~~~~~~~~
 

source/extensions/omni.isaac.orbit/omni/isaac/orbit/app.py

@@ -585,6 +585,9 @@ def _load_extensions(self):
         carb_settings_iface = carb.settings.get_settings()
 
         if self._livestream >= 1:
+            # Ensure that a viewport exists in case an experience has been
+            # loaded which does not load it by default
+            enable_extension("omni.kit.viewport.window")
             # Set carb settings to allow for livestreaming
             carb_settings_iface.set_bool("/app/livestream/enabled", True)
             carb_settings_iface.set_bool("/app/window/drawMouse", True)