Fix some failing tests

Author: kovidgoyal

kitty_tests/check_build.py

@@ -27,10 +27,9 @@ def test_exe(self) -> None:
 
     def test_loading_extensions(self) -> None:
         import kitty.fast_data_types as fdt
-        from kittens.choose import subseq_matcher
         from kittens.diff import diff_speedup
         from kittens.transfer import rsync
-        del fdt, subseq_matcher, diff_speedup, rsync
+        del fdt, diff_speedup, rsync
 
     def test_loading_shaders(self) -> None:
         from kitty.utils import load_shaders

tools/themes/collection.go

@@ -966,7 +966,7 @@ func GetThemeNames(cache_age time.Duration) (ans []string, err error) {
 
 func CompleteThemes(completions *cli.Completions, word string, arg_num int) {
 	names, err := GetThemeNames(-1)
-	if err != nil {
+	if err == nil {
 		mg := completions.AddMatchGroup("Themes")
 		for _, theme_name := range names {
 			theme_name = strings.TrimSpace(theme_name)