Fixed mutation rate CLI corner case.

tskit-dev · May 26, 2015 · d4e32e1 · d4e32e1
1 parent 1ead257
commit d4e32e1
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/msprime/cli.py b/msprime/cli.py
@@ -213,7 +213,7 @@ def mspms_main():
             help="Maximum memory used. Supports K,M and G suffixes")
 
     args = parser.parse_args()
-    if args.mutation_rate is None and not args.trees:
+    if args.mutation_rate == 0 and not args.trees:
         parser.error("Need to specify at least one of --theta or --trees")
     sr = create_simulation_runner(args)
     sr.run(sys.stdout)