#74 Don't fail when runned without args

tests/test_main.py

@@ -61,6 +61,7 @@ def test_get_command():
                                       stdout=PIPE,
                                       stderr=PIPE,
                                       env={'LANG': 'C'})
+        assert main.get_command(Mock(), ['']) is None
 
 
 def test_get_matched_rule():

thefuck/main.py

@@ -80,6 +80,10 @@ def get_command(settings, args):
         script = ' '.join(arg.decode('utf-8') for arg in args[1:])
     else:
         script = ' '.join(args[1:])
+
+    if not script:
+        return
+
     result = Popen(script, shell=True, stdout=PIPE, stderr=PIPE,
                    env=dict(os.environ, LANG='C'))
     if wait_output(settings, result):