patch 8.0.0087

Problem:    When the channel callback gets job info the job may already have
            been deleted. (lifepillar)
Solution:   Do not delete the job when the channel is still useful. (ichizok,
            closes #1242, closes #1245)

src/structs.h

@@ -1421,11 +1421,13 @@ struct partial_S
     dict_T	*pt_dict;	/* dict for "self" */
 };
 
+/* Status of a job.  Order matters! */
 typedef enum
 {
     JOB_FAILED,
     JOB_STARTED,
-    JOB_ENDED
+    JOB_ENDED,	    /* detected job done */
+    JOB_FINISHED    /* job done and cleanup done */
 } jobstatus_T;
 
 /*