fix linting

Author: eleanorjboyd

src/features/creators/existingProjects.ts

@@ -56,13 +56,13 @@ export class ExistingProjects implements PythonProjectCreator {
 
         if (filtered.length === 0) {
             // No new projects found that are not already in the project manager
+            const formattedProjectPaths =
+                existingAddUri === undefined ? 'None' : existingAddUri.map((uri) => uri.fsPath).join(', ');
             traceInfo(
-                `All selected resources are already registered in the project manager: ${existingAddUri
-                    .map((uri) => uri.fsPath)
-                    .join(', ')}`,
+                `All selected resources are already registered in the project manager. Resources selected: ${formattedProjectPaths}`,
             );
             setImmediate(() => {
-                if (existingAddUri.length === 1) {
+                if (existingAddUri && existingAddUri.length === 1) {
                     showWarningMessage(`Selected resource already exists as project.`);
                 } else {
                     showWarningMessage('Selected resources already exist as projects.');