Add check in init.lua to prevent nil access

[JoBoCl]

Currently, this is cause the plugin to crash (#32) when running any test.

[rouge8]

Can you add a test for when this happens? It sounds like the XML file exists, but maybe no tests were run?

[tuanbass]

Can you add a test for when this happens? It sounds like the XML file exists, but maybe no tests were run?

I ran into the issue today. I create a simple repo to help reproducing the problem at https://github.com/tuanbass/test-ws-rust

open foo/src/lib.rs and try to run the test.

But the fix, while necessary, still does not resolve the root cause. No more crash, but the test was not run.
The root cause seem is occurred when determined the cwd to run cargo nextest command for rust project with workspace enable.
When open such project, the cwd is set to root project's path not the member's one. Hence cargo nextest cannot found any test/test suite.

[tuanbass]

Can you add a test for when this happens? It sounds like the XML file exists, but maybe no tests were run?

After some debug, seem it's set to workspace's root by intention, but I cannot figure out the result behind.
A simple patch fixes the problem with workspace, but I'm not sure whether it causes other problem :lol