Fix server error when empty configuration is passed

This is already fixed upstream, but not in the PHAR we download.

References #460

lib/SerenataClient.js

@@ -166,11 +166,14 @@ class SerenataClient extends AutoLanguageClient
     }
 
     getInitializeParams(projectPath, process) {
-        const params = super.getInitializeParams(projectPath, process);
+        const params = super.getInitializeParams(projectPath, process),
+            configuration = this.container.getProjectManager().getCurrentProjectSettings();
 
-        params.initializationOptions = {
-            configuration: this.container.getProjectManager().getCurrentProjectSettings(),
-        };
+        if (configuration !== null) {
+            params.initializationOptions = {
+                configuration: configuration,
+            };
+        }
 
         return params;
     }