fix: Fixing NPE bug by adding to if clause (#3290)

* fix: fixing bug by adding to if clause

* fix: fixing formatting

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/BigQueryImpl.java

@@ -427,7 +427,9 @@ public com.google.api.services.bigquery.model.Job call() {
     }
 
     if (!idRandom) {
-      if (createException instanceof BigQueryException && createException.getCause() != null) {
+      if (createException instanceof BigQueryException
+          && createException.getCause() != null
+          && createException.getCause().getMessage() != null) {
 
         /*GoogleJsonResponseException createExceptionCause =
         (GoogleJsonResponseException) createException.getCause();*/