Allow client to respond to workspace/configuration with null values

This is allowed per the spec if the client doesn't know about the configuration
we've requested.

1 files changed, 2 insertions, 0 deletions

diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index a41f7f564..bb7c4c0c6 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -468,6 +468,8 @@ impl GlobalState {
                             }
                             (None, Some(mut configs)) => {
                                 if let Some(json) = configs.get_mut(0) {
+                                    // Note that json can be null according to the spec if the client can't
+                                    // provide a configuration. This is handled in Config::update below.
                                     let mut config = this.config.clone();
                                     config.update(json.take());
                                     this.update_configuration(config);