Handle camera cancellation (#11322)

src/view/com/composer/photos/OpenCameraBtn.tsx

@@ -32,6 +32,9 @@ export function OpenCameraBtn({disabled, onAdd}: OpenCameraBtnProps) {
       const img = await openCamera({
         aspect: [1, 1],
       })
+      if (!img) {
+        return
+      }
 
       // If we don't have permissions it's fine, we just wont save it. The post itself will still have access to
       // the image even without these permissions