Merge branch 'main' into fix-cluster-mode-issue

Author: pravinbhat

src/main/java/datastax/astra/migrate/AbstractJobSession.java

@@ -25,6 +25,11 @@ protected AbstractJobSession(CqlSession sourceSession, CqlSession astraSession,
 
     protected AbstractJobSession(CqlSession sourceSession, CqlSession astraSession, SparkConf sc, boolean isJobMigrateRowsFromFile) {
         super(sc);
+        
+        if (sourceSession == null) {
+            return;
+        }
+        
         this.sourceSession = sourceSession;
         this.astraSession = astraSession;