patch 8.1.0590: when a job ends the closed channels are not handled

Problem:    When a job ends the closed channels are not handled.
Solution:   When a job is detected to have ended, check the channels again.
            (closes #3530)

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    590,
 /**/
     589,
 /**/