Fixed dump last queue status on failure

src/main/groovy/nextflow/executor/AbstractGridExecutor.groovy

@@ -41,6 +41,8 @@ abstract class AbstractGridExecutor extends Executor {
 
     private final static List<String> INVALID_NAME_CHARS = [ " ", "/", ":", "@", "*", "?", "\\n", "\\t", "\\r" ]
 
+    private Map lastQueueStatus
+
     /**
      * Initialize the executor class
      */
@@ -289,7 +291,7 @@ abstract class AbstractGridExecutor extends Executor {
     }
 
     @PackageScope
-    String dumpQueueStatus(Map<String,QueueStatus> statusMap) {
+    final String dumpQueueStatus(Map<String,QueueStatus> statusMap) {
         if( statusMap == null )
             return '  (null)'
         if( statusMap.isEmpty() )
@@ -302,6 +304,11 @@ abstract class AbstractGridExecutor extends Executor {
         return result.toString()
     }
 
+    @PackageScope
+    final String dumpQueueStatus() {
+        dumpQueueStatus(lastQueueStatus)
+    }
+
     /**
      * @param queue The command for which the status of jobs has be to read
      * @return The command line to be used to retried the job statuses
@@ -322,7 +329,7 @@ abstract class AbstractGridExecutor extends Executor {
      * @return {@code true} if the job is in RUNNING or HOLD status, or even if it is temporarily unable
      *  to retrieve the job status for some
      */
-    public boolean checkActiveStatus( jobId, queue ) {
+    boolean checkActiveStatus( jobId, queue ) {
         assert jobId
 
         // -- fetch the queue status
@@ -331,6 +338,8 @@ abstract class AbstractGridExecutor extends Executor {
             log.trace "[${name.toUpperCase()}] queue ${queue?"($queue) ":''}status >\n" + dumpQueueStatus(result)
             return result
         }
+        // track the last status for debugging purpose
+        lastQueueStatus = status
 
         if( status == null ) { // no data is returned, so return true
             return true