check that config file exists before reading

Author: Green-Avocado

lib/index.js

@@ -452,12 +452,15 @@ class RustLanguageClient extends AutoLanguageClient {
     // Don't build straight after initialize, wait for first `workspace/didChangeConfiguration`
     params.initializationOptions.omitInitBuild = true
 
-    try {
-        let rlsConfigPath = path.join(projectPath, "rust-analyzer.json")
-        let options = fs.readFileSync(rlsConfigPath)
-        Object.assign(params.initializationOptions, JSON.parse(options))
-    } catch(e) {
-        console.warn("Could not read config file")
+    let rlsConfigPath = path.join(projectPath, "rust-analyzer.json")
+
+    if (fs.existsSync(rlsConfigPath)) {
+        try {
+            let options = fs.readFileSync(rlsConfigPath)
+            Object.assign(params.initializationOptions, JSON.parse(options))
+        } catch(e) {
+            console.warn("Error reading config file\n", e)
+        }
     }
 
     return params