Handle errors better in tables.scala

[larsgeorge-db]

URL: https://e2-demo-field-eng.cloud.databricks.com/?o=1444828305810485#job/18199892189402/run/374920315594814

NoSuchDatabaseException: [SCHEMA_NOT_FOUND] The schema `tomasz_kurzydym_002i_da_sml` cannot be found. Verify the spelling and correctness of the schema and catalog.
If you did not qualify the name with a catalog, verify the current_schema() output, or qualify the name with the correct catalog.
To tolerate the error on drop use DROP SCHEMA IF EXISTS.
If you did not qualify the name with a catalog, verify the current_schema() output, or qualify the name with the correct catalog.
To tolerate the error on drop use DROP SCHEMA IF EXISTS.
	at org.apache.spark.sql.catalyst.catalog.ExternalCatalog.requireDbExists(ExternalCatalog.scala:42)
	at org.apache.spark.sql.catalyst.catalog.ExternalCatalog.requireDbExists$(ExternalCatalog.scala:40)
	at org.apache.spark.sql.hive.HiveExternalCatalog.requireDbExists(HiveExternalCatalog.scala:68)
	at org.apache.spark.sql.hive.HiveExternalCatalog.$anonfun$listTables$1(HiveExternalCatalog.scala:1055)
	at com.databricks.spark.util.FrameProfiler$.record(FrameProfiler.scala:94)
	at org.apache.spark.sql.hive.HiveExternalCatalog.$anonfun$withClient$2(HiveExternalCatalog.scala:155)
	at org.apache.spark.sql.hive.HiveExternalCatalog.maybeSynchronized(HiveExternalCatalog.scala:116)
	at org.apache.spark.sql.hive.HiveExternalCatalog.$anonfun$withClient$1(HiveExternalCatalog.scala:154)
	at com.databricks.backend.daemon.driver.ProgressReporter$.withStatusCode(ProgressReporter.scala:364)
	at com.databricks.spark.util.SparkDatabricksProgressReporter$.withStatusCode(ProgressReporter.scala:34)
	at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:153)
	at org.apache.spark.sql.hive.HiveExternalCatalog.listTables(HiveExternalCatalog.scala:1054)
	at com.databricks.sql.acl.SecuredHiveExternalCatalog.com$databricks$sql$acl$SecuredExternalCatalog$$super$listTables(SecuredHiveExternalCatalog.scala:26)
	at com.databricks.sql.acl.SecuredExternalCatalog.$anonfun$listTables$3(SecuredExternalCatalog.scala:85)
	at com.databricks.backend.daemon.driver.ProgressReporter$.withStatusCode(ProgressReporter.scala:364)
	at com.databricks.spark.util.SparkDatabricksProgressReporter$.withStatusCode(ProgressReporter.scala:34)
	at com.databricks.sql.acl.SecuredExternalCatalog.listTables(SecuredExternalCatalog.scala:85)
	at com.databricks.sql.acl.SecuredExternalCatalog.listTables$(SecuredExternalCatalog.scala:80)
	at com.databricks.sql.acl.SecuredHiveExternalCatalog.listTables(SecuredHiveExternalCatalog.scala:26)
	at org.apache.spark.sql.catalyst.catalog.ExternalCatalogWithListener.$anonfun$listTables$1(ExternalCatalogWithListener.scala:188)
	at org.apache.spark.sql.catalyst.MetricKeyUtils$.measure(MetricKey.scala:311)
	at org.apache.spark.sql.catalyst.catalog.ExternalCatalogWithListener.$anonfun$profile$1(ExternalCatalogWithListener.scala:54)
	at com.databricks.spark.util.FrameProfiler$.record(FrameProfiler.scala:94)
	at org.apache.spark.sql.catalyst.catalog.ExternalCatalogWithListener.profile(ExternalCatalogWithListener.scala:53)
	at org.apache.spark.sql.catalyst.catalog.ExternalCatalogWithListener.listTables(ExternalCatalogWithListener.scala:188)
	at $linedaa40f8f4b024c098bbf51b3db71961f25.$read$$iw$$iw$$iw$$iw$$iw$$iw.$anonfun$metadataForAllTables$1(
command-3121298695456685:13)
	at scala.collection.parallel.mutable.ParArray$ParArrayIterator.flatmap2combiner(ParArray.scala:419)
	at scala.collection.parallel.ParIterableLike$FlatMap.leaf(ParIterableLike.scala:1082)
	at scala.collection.parallel.Task.$anonfun$tryLeaf$1(Tasks.scala:53)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
	at scala.util.control.Breaks$$anon$1.catchBreak(Breaks.scala:67)
	at scala.collection.parallel.Task.tryLeaf(Tasks.scala:56)
	at scala.collection.parallel.Task.tryLeaf$(Tasks.scala:50)
	at scala.collection.parallel.ParIterableLike$FlatMap.tryLeaf(ParIterableLike.scala:1078)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$WrappedTask.internal(Tasks.scala:170)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$WrappedTask.internal$(Tasks.scala:157)
	at scala.collection.parallel.AdaptiveWorkStealingForkJoinTasks$WrappedTask.internal(Tasks.scala:440)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$WrappedTask.compute(Tasks.scala:150)
	at scala.collection.parallel.AdaptiveWorkStealingTasks$WrappedTask.compute$(Tasks.scala:149)
	at scala.collection.parallel.AdaptiveWorkStealingForkJoinTasks$WrappedTask.compute(Tasks.scala:440)
	at java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:189)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)