On some devices `android.hardware.Camera.open` returns null instead of raising exception. It causes `NPE` inside `Camera1Session.create` when method `setPreviewTexture` is invoked on local variable `camera`, which is `null`. Bug: webrtc:8658 Change-Id: Ic65b4aef2c0b8b65735a9db02433b536bfe92ddd Reviewed-on: https://webrtc-review.googlesource.com/33620 Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Commit-Queue: Sami Kalliomäki <sakal@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21352}