Extra check for non-recognized branch identified in the blob during receive.

src/ChamiloLMS/Transaction/TransactionLogController.php

@@ -567,6 +567,9 @@ class TransactionLogController
             try {
                 $blob_metadata = Envelope::identifyBlobMetadata($blob);
                 $origin_branch = $this->branchRepository->find($blob_metadata['origin_branch_id']);
+                if (!$origin_branch) {
+                    throw new Exception(sprintf('Cannot find a local branch with id %s', $blob_metadata['origin_branch_id']));
+                }
                 $wrapper_plugin = self::createPlugin('wrapper', $blob_metadata['blob_type'], $origin_branch->getPluginData('wrapper'));
                 $envelope_data = array('blob' => $blob, 'origin_branch_id' => $blob_metadata['origin_branch_id']);
                 $envelope = new Envelope($wrapper_plugin, $envelope_data);