From 959f978abb6f1b5beb2adbb2986de06aca09a050 Mon Sep 17 00:00:00 2001
From: Nathan Baker <nathanandrewbaker@gmail.com>
Date: Wed, 27 May 2020 07:39:41 -0700
Subject: [PATCH] Add default argument to loadOptions().

Fixes https://github.com/jensengroup/propka-3.1/issues/46
---
 propka/lib.py | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/propka/lib.py b/propka/lib.py
index cd25446..6a7958c 100644
--- a/propka/lib.py
+++ b/propka/lib.py
@@ -222,7 +222,7 @@ def build_parser(parser=None):
     return parser
 
 
-def loadOptions(args):
+def loadOptions(args=None):
     """
     Load the arguments parser with options. Note that verbosity is set as soon
     as this function is invoked.
@@ -232,9 +232,8 @@ def loadOptions(args):
     Returns:
         argparse namespace
     """
-    # defining a 'usage' message
-    usage = "usage: %prog [options] filename"
-
+    if args == None:
+        args = []
     # loading the parser
     parser = build_parser()