Index: /issm/trunk-jpl/test/NightlyRun/runme.py
===================================================================
--- /issm/trunk-jpl/test/NightlyRun/runme.py	(revision 27780)
+++ /issm/trunk-jpl/test/NightlyRun/runme.py	(revision 27781)
@@ -123,8 +123,11 @@
     i1, i2 = parallelrange(rank, numprocs, len(list_ids))  # Get tests for this CPU only
     list_ids = list_ids[i1:i2 + 1]
-    if np.size(id) > 0 and id is not None:
-    #if len(id[0]) > 0 or len(id[1]) > 0:
-        test_ids = set(GetIds(id)).intersection(set(list_ids))
-        benchmark = None
+    if id is not None:
+        if np.size(id) > 0 or (len(id[0]) > 0 or len(id[1]) > 0):
+            test_ids = set(GetIds(id)).intersection(set(list_ids))
+            benchmark = None
+        else:
+            print(('runme error: \'id\' argument "{}" does not follow the required protocol. When calling runme as a function from Python runtime, use runme(<int>). If calling runme.py from command line, use runme.py <options>'.format(id)))
+            exit()
     else:
         # If no tests are specifically provided, do them all
@@ -135,4 +138,5 @@
     exclude_ids = GetIds(exclude)
     test_ids = test_ids.difference(exclude_ids)
+
     # }}}
     if procedure == 'runFromNC':
@@ -175,4 +179,5 @@
     test_ids = list(test_ids)
     test_ids.sort()
+
     # }}}