fix: add workspace folder checks for code indexing operations

- Add null checks for codeIndexManager in webviewMessageHandler
- Show translated error message when no workspace folder is open
- Prevents crashes when users try to use indexing features without a workspace
- Uses existing translation key from orchestrator

Author: daniel-lxs

src/core/webview/webviewMessageHandler.ts

@@ -2092,6 +2092,19 @@ export const webviewMessageHandler = async (
 							}
 						}
 					}
+				} else {
+					// No workspace open - send error status
+					provider.log("Cannot save code index settings: No workspace folder open")
+					await provider.postMessageToWebview({
+						type: "indexingStatusUpdate",
+						values: {
+							systemStatus: "Error",
+							message: t("embeddings:orchestrator.indexingRequiresWorkspace"),
+							processedItems: 0,
+							totalItems: 0,
+							currentItemUnit: "items",
+						},
+					})
 				}
 			} catch (error) {
 				provider.log(`Error saving code index settings: ${error.message || error}`)
@@ -2105,7 +2118,22 @@ export const webviewMessageHandler = async (
 		}
 
 		case "requestIndexingStatus": {
-			const status = provider.codeIndexManager!.getCurrentStatus()
+			const manager = provider.codeIndexManager
+			if (!manager) {
+				// No workspace open - send error status
+				provider.postMessageToWebview({
+					type: "indexingStatusUpdate",
+					values: {
+						systemStatus: "Error",
+						message: t("embeddings:orchestrator.indexingRequiresWorkspace"),
+						processedItems: 0,
+						totalItems: 0,
+						currentItemUnit: "items",
+					},
+				})
+				return
+			}
+			const status = manager.getCurrentStatus()
 			provider.postMessageToWebview({
 				type: "indexingStatusUpdate",
 				values: status,
@@ -2136,7 +2164,22 @@ export const webviewMessageHandler = async (
 		}
 		case "startIndexing": {
 			try {
-				const manager = provider.codeIndexManager!
+				const manager = provider.codeIndexManager
+				if (!manager) {
+					// No workspace open - send error status
+					provider.postMessageToWebview({
+						type: "indexingStatusUpdate",
+						values: {
+							systemStatus: "Error",
+							message: t("embeddings:orchestrator.indexingRequiresWorkspace"),
+							processedItems: 0,
+							totalItems: 0,
+							currentItemUnit: "items",
+						},
+					})
+					provider.log("Cannot start indexing: No workspace folder open")
+					return
+				}
 				if (manager.isFeatureEnabled && manager.isFeatureConfigured) {
 					if (!manager.isInitialized) {
 						await manager.initialize(provider.contextProxy)
@@ -2151,7 +2194,18 @@ export const webviewMessageHandler = async (
 		}
 		case "clearIndexData": {
 			try {
-				const manager = provider.codeIndexManager!
+				const manager = provider.codeIndexManager
+				if (!manager) {
+					provider.log("Cannot clear index data: No workspace folder open")
+					provider.postMessageToWebview({
+						type: "indexCleared",
+						values: {
+							success: false,
+							error: t("embeddings:orchestrator.indexingRequiresWorkspace"),
+						},
+					})
+					return
+				}
 				await manager.clearIndexData()
 				provider.postMessageToWebview({ type: "indexCleared", values: { success: true } })
 			} catch (error) {