fix(CR-317): player crushes on reload (#985)

### Description of the Changes

bugfix, regression from
[fix](#982).

**Issue:**
player crushes when executing `updatePlayerClientRect` with an undefined
`playerContainer`.

**Fix:**
execute `updatePlayerClientRect` only if `playerContainer` exists.

#### Resolves CR-317

Author: lianbenjamin

src/components/shell/shell.tsx

@@ -263,7 +263,9 @@ class Shell extends Component<any, any> {
       this.props.updatePlayerClientRect(playerContainer.getBoundingClientRect());
     }
     setTimeout(() => {
-      this.props.updatePlayerClientRect(playerContainer?.getBoundingClientRect());
+      if (playerContainer) {
+        this.props.updatePlayerClientRect(playerContainer.getBoundingClientRect());
+      }
     }, ON_PLAYER_RECT_CHANGE_DEBOUNCE_DELAY);
   };