fix(avahi-browse): nounset mode error on unknown option

Author: scop

completions/avahi-browse

@@ -18,7 +18,7 @@ _comp_cmd_avahi_browse()
 
     if [[ $cur == -* ]]; then
         COMPREPLY=($(compgen -W '$(_parse_help "$1")' -- "$cur"))
-        [[ $COMPREPLY != *= ]] || compopt -o nospace
+        [[ ${COMPREPLY-} != *= ]] || compopt -o nospace
         return
     fi
 

test/t/test_avahi_browse.py

@@ -20,3 +20,8 @@ def test_service_types(self, completion):
     @pytest.mark.complete("avahi-browse -a _")
     def test_no_service_type_with_a(self, completion):
         assert not completion
+
+    @pytest.mark.complete("avahi-browse --dont-fail-in-unset-mode")
+    def test_unknown_option(self, completion):
+        # Just see that it does not error out
+        pass