completions-getter: Support complete actions with only options

This is actually supported even though we were ignoring it

Author: 3v1n0

bash-completions-getter.sh

@@ -215,7 +215,8 @@ get_completions() {
             echo -n "WORDS: " >&2; printf "'%s'," "${COMPLETE_WORDS[@]}" >&2; echo >&2
         fi
 
-        if [ ${#COMPLETE_WORDS[@]} -gt 0 ]; then
+        if [ ${#COMPLETE_WORDS[@]} -gt 0 ] ||
+           [ ${#COMPLETE_OPTIONS[@]} -gt 0 ]; then
             echo "${_COMP_OPTIONS[@]}"
             printf "%s\n" "${COMPLETE_WORDS[@]}"
             return 0

tests/test-bash-completions-getter.sh

@@ -115,8 +115,8 @@ check_completion foo-with-multiple-options "foo" "nosort nospace"
 complete -o nospace -W "foo bar" -o nosort foo-with-multiple-words-and-options
 check_completion foo-with-multiple-words-and-options "foo bar" "nosort nospace"
 
-complete -o nospace -o nosort foo-with-only-options
-expect_failure foo-with-only-options
+complete -o nospace -o nosort -o default foo-with-only-options
+check_completion foo-with-only-options '' "default nosort nospace"
 
 complete -F foo_complete_function_not_existant foo-with-function-invalid
 expect_failure foo-with-function-invalid