[litho] Handle non-existing caller path
[litho] Handle non-existing caller path

Reviewed By: skcho

Differential Revision: D26975222

fbshipit-source-id: 758c4f0b3

jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer