fix(amazonq): Wrap repomap LSP call with try catch (#7992)

## Problem


## Solution


---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: leigaol

packages/core/src/codewhisperer/util/supplementalContext/crossFileContextUtil.ts

@@ -202,15 +202,19 @@ export async function fetchProjectContext(
     target: 'default' | 'codemap' | 'bm25',
     languageclient?: LanguageClient
 ): Promise<CodeWhispererSupplementalContextItem[]> {
-    if (languageclient) {
-        const request: GetSupplementalContextParams = {
-            filePath: editor.document.uri.fsPath,
+    try {
+        if (languageclient) {
+            const request: GetSupplementalContextParams = {
+                filePath: editor.document.uri.fsPath,
+            }
+            const response = await languageclient.sendRequest<SupplementalContextItem[]>(
+                getSupplementalContextRequestType.method,
+                request
+            )
+            return response as CodeWhispererSupplementalContextItem[]
         }
-        const response = await languageclient.sendRequest<SupplementalContextItem[]>(
-            getSupplementalContextRequestType.method,
-            request
-        )
-        return response as CodeWhispererSupplementalContextItem[]
+    } catch (error) {
+        return []
     }
     return []
 }