fix FileDetailsFragmentBinding.progressBlock' on a null object reference

Signed-off-by: alperozturk <[email protected]>

Author: alperozturk96

app/src/main/java/com/owncloud/android/ui/fragment/FileDetailFragment.java

@@ -231,6 +231,7 @@ public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
         }
 
         binding = FileDetailsFragmentBinding.inflate(inflater, container, false);
+        observeWorkerState();
         view = binding.getRoot();
 
         if (getFile() == null || user == null) {
@@ -610,8 +611,6 @@ public void updateFileDetails(boolean transferring, boolean refresh) {
         if (view != null) {
             view.invalidate();
         }
-
-        observeWorkerState();
     }
 
     @Subscribe(threadMode = ThreadMode.MAIN)
@@ -627,6 +626,10 @@ public void onDownloadProgress(FileDownloadProgressEvent event) {
 
     private void observeWorkerState() {
         ActivityExtensionsKt.observeWorker(requireActivity(), state -> {
+            if (binding == null) {
+                return Unit.INSTANCE;
+            }
+
             if (state instanceof WorkerState.FileUploadStarted) {
                 binding.progressText.setText(R.string.uploader_upload_in_progress_ticker);
             } else {