Fix crash in threadsRequest with no miDebugger, and undefined thread names

src/backend/backend.ts

@@ -13,7 +13,8 @@ export interface Breakpoint {
 
 export interface Thread {
 	id: number;
-	name: string;
+	targetId: string;
+	name?: string;
 }
 
 export interface Stack {

src/backend/mi2/mi2.ts

@@ -598,12 +598,17 @@ export class MI2 extends EventEmitter implements IBackend {
 		let threads = result.result("threads");
 		let ret: Thread[] = [];
 		return threads.map(element => {
-			let id = parseInt(MINode.valueOf(element, "id"));
-			let name = MINode.valueOf(element, "name") + "";
-			return {
-				id,
-				name
+			let ret : Thread = {
+				id: parseInt(MINode.valueOf(element, "id")),
+				targetId: MINode.valueOf(element, "target-id")
 			};
+
+			let name = MINode.valueOf(element, "name");
+			if (name) {
+				ret.name = name;
+			}
+			
+			return ret;
 		});
 	}
 

src/mibase.ts

@@ -235,6 +235,8 @@ export class MI2DebugSession extends DebugSession {
 				Promise.all(all).then(brkpoints => {
 					let finalBrks = [];
 					brkpoints.forEach(brkp => {
+						// TODO: Currently all breakpoints returned are marked as verified,
+						// which leads to verified breakpoints on a broken lldb.
 						if (brkp[0])
 							finalBrks.push(new DebugAdapter.Breakpoint(true, brkp[1].line));
 					});
@@ -256,13 +258,24 @@ export class MI2DebugSession extends DebugSession {
 	}
 
 	protected threadsRequest(response: DebugProtocol.ThreadsResponse): void {
+		if (!this.miDebugger) {
+			this.sendResponse(response);
+		}
 		this.miDebugger.getThreads().then(
 			threads => {
 				response.body = {
 					threads: []
 				};
 				for (const thread of threads) {
-					response.body.threads.push(new Thread(thread.id, thread.id + ":" + thread.name));
+					let threadName = thread.name;
+					// TODO: Thread names are undefined on LLDB
+					if (threadName === undefined) {
+						threadName = thread.targetId;
+					}
+					if (threadName === undefined) {
+						threadName = "<unnamed>";
+					}
+					response.body.threads.push(new Thread(thread.id, thread.id + ":" + threadName));
 				}
 				this.sendResponse(response);
 			});