Continue uploading the files to OwnCloud if the folder creation fails

OwnCloud seems to report an error, if we try to create a folder that
already exists. We don't care, so we just go ahead uploading the files
instead of throwing an exception.

Author: rivaldi8

app/src/main/java/org/gnucash/android/export/ExportAsyncTask.java

@@ -387,8 +387,10 @@ private void moveExportToOwnCloud() throws Exporter.ExporterException {
         if (mOC_dir.length() != 0) {
             RemoteOperationResult dirResult = new CreateRemoteFolderOperation(
                     mOC_dir, true).execute(mClient);
-            if (!dirResult.isSuccess())
-                throw new Exporter.ExporterException(mExportParams, dirResult.getLogMessage());
+            if (!dirResult.isSuccess()) {
+                Log.w(TAG, "Error creating folder (it may happen if it already exists): "
+                           + dirResult.getLogMessage());
+            }
         }
         for (String exportedFilePath : mExportedFiles) {
             String remotePath = mOC_dir + FileUtils.PATH_SEPARATOR + stripPathPart(exportedFilePath);