Set default empty string for apiModelId when undefined

Ensure apiModelId always has a string value by providing empty string fallback when undefined, matching the pattern used for other optional fields in the stateValues object. This prevents potential undefined values in the API configuration.

Author: NyxJae

src/core/webview/ClineProvider.ts

@@ -1312,7 +1312,7 @@ export class ClineProvider extends EventEmitter<ClineProviderEvents> implements
 			apiConfiguration: providerSettings,
 			lastShownAnnouncementId: stateValues.lastShownAnnouncementId,
 			customInstructions: stateValues.customInstructions,
-			apiModelId: stateValues.apiModelId,
+			apiModelId: stateValues.apiModelId ?? "",
 			alwaysAllowReadOnly: stateValues.alwaysAllowReadOnly ?? false,
 			alwaysAllowReadOnlyOutsideWorkspace: stateValues.alwaysAllowReadOnlyOutsideWorkspace ?? false,
 			alwaysAllowWrite: stateValues.alwaysAllowWrite ?? false,