[CARBONDATA-3302] [Spark-Integration] code cleaning related to Carbon…

…CreateTable command

## What changes were proposed in this pull request?
Extra check to validate whether the stream relation is not null , moreover condition can be optimized further, currently the condition has path validation whether path is part of s3 file system and then system is  checking whether the stream relation is not null, thi check can be first as this overall condition has to be evaluated for stream table

## How was this patch tested?

Manual testing and existing testcases

integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/table/CarbonCreateTableCommand.scala

@@ -78,8 +78,8 @@ case class CarbonCreateTableCommand(
         path
       }
       val streaming = tableInfo.getFactTable.getTableProperties.get("streaming")
-      if (path.startsWith("s3") && streaming != null && streaming != null &&
-          streaming.equalsIgnoreCase("true")) {
+      if (streaming != null &&
+        streaming.equalsIgnoreCase("true") && path.startsWith("s3")) {
         throw new UnsupportedOperationException("streaming is not supported with s3 store")
       }
       tableInfo.setTablePath(tablePath)