Address comment.

Author: viirya

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileScanRDD.scala

@@ -143,13 +143,13 @@ class FileScanRDD(
                   } catch {
                     case e @(_: RuntimeException | _: IOException) =>
                       logWarning(s"Skipped the rest content in the corrupted file: $currentFile", e)
-                      null
+                      Iterator.empty
                   }
                 }
 
                 override def getNext(): AnyRef = {
                   try {
-                    if (internalIter != null && internalIter.hasNext) {
+                    if (internalIter.hasNext) {
                       internalIter.next()
                     } else {
                       finished = true