Return empty results if query node is nil

[gordon-klotho]

Standard checks

• Unit tests: Any special considerations?
• Docs: Do we need to update any docs, internal or public?
• Backwards compatibility: Will this break existing apps? If so, what would be the extra work required to keep them working?

[github-actions]

Package	Line Rate	Health
github.com/klothoplatform/klotho/pkg/analytics	3%	❌
github.com/klothoplatform/klotho/pkg/annotation	23%	❌
github.com/klothoplatform/klotho/pkg/cli	4%	❌
github.com/klothoplatform/klotho/pkg/core	21%	❌
github.com/klothoplatform/klotho/pkg/env_var	82%	✔
github.com/klothoplatform/klotho/pkg/exec_unit	54%	➖
github.com/klothoplatform/klotho/pkg/infra/kubernetes	59%	➖
github.com/klothoplatform/klotho/pkg/infra/kubernetes/helm	39%	❌
github.com/klothoplatform/klotho/pkg/input	72%	➖
github.com/klothoplatform/klotho/pkg/lang	38%	❌
github.com/klothoplatform/klotho/pkg/lang/dockerfile	0%	❌
github.com/klothoplatform/klotho/pkg/lang/golang	36%	❌
github.com/klothoplatform/klotho/pkg/lang/javascript	48%	❌
github.com/klothoplatform/klotho/pkg/lang/python	63%	➖
github.com/klothoplatform/klotho/pkg/lang/yaml	0%	❌
github.com/klothoplatform/klotho/pkg/logging	6%	❌
github.com/klothoplatform/klotho/pkg/multierr	95%	✔
github.com/klothoplatform/klotho/pkg/provider/aws	50%	➖
github.com/klothoplatform/klotho/pkg/provider/aws/resources	70%	➖
github.com/klothoplatform/klotho/pkg/runtime	78%	✔
github.com/klothoplatform/klotho/pkg/static_unit	33%	❌
github.com/klothoplatform/klotho/pkg/updater	30%	❌
github.com/klothoplatform/klotho/pkg/validation	74%	➖
github.com/klothoplatform/klotho/pkg/yaml_util	79%	✔
Summary	42% (4166 / 9912)	❌