Handle rare case were camera was not null and previewSize was while asynchronously initializing the camera

Author: ajungg

ui/src/main/java/io/snabble/sdk/ui/scanner/BarcodeScannerView.java

@@ -726,7 +726,7 @@ public void setRestrictScanningToIndicator(boolean restrictScanningToIndicator)
     }
 
     private void updateTransform() {
-        if(camera == null){
+        if(camera == null || previewSize == null){
             return;
         }