Fix errors

Author: ovidiuostoia

vscode-tcf-debug/src/debugProvider.ts

@@ -449,6 +449,11 @@ export class TCFDebugSession extends LifetimeDebugSession {
 			//single context hit, find the corresponding threadId
 			const context = contexts.values().next().value;
 
+			if (!context) {
+				this.console.log(`No valid context found for breakpoint ${breakpointID}. Ignoring`);
+				return;
+			}
+
 			void (this.verifyInlinedBreakpoint(context, breakpointTcfId)); //TODO: Should this be await-ed instead of ignored with the void operator?
 
 			//NOTE: *If* we don't know the thread ID, it may be a new thread or we have never had a threadsRequest.

vscode-tcf-debug/src/tcfclient.ts

@@ -239,7 +239,7 @@ export abstract class TCFClient extends AbstractTCFClient {
      * @returns a list of buffers with the first 'error' buffer empty.
      */
     private static noError(buffers: Buffer[]): Buffer[] {
-        return [EMPTY_BUFFER].concat(buffers);
+        return [EMPTY_BUFFER, ...buffers];
     }
 
     //see https://download.eclipse.org/tools/tcf/tcf-docs/TCF%20Service%20-%20Run%20Control.html#Events