debug: filter out variables with no name specified

fixes #26589

src/vs/workbench/parts/debug/common/debugModel.ts

@@ -180,7 +180,7 @@ export class ExpressionContainer implements IExpressionContainer {
 			count,
 			filter
 		}).then(response => {
-			return response && response.body && response.body.variables ? distinct(response.body.variables.filter(v => !!v), v => v.name).map(
+			return response && response.body && response.body.variables ? distinct(response.body.variables.filter(v => !!v && v.name), v => v.name).map(
 				v => new Variable(this.process, this, v.variablesReference, v.name, v.evaluateName, v.value, v.namedVariables, v.indexedVariables, v.type)
 			) : [];
 		}, (e: Error) => [new Variable(this.process, this, 0, null, e.message, '', 0, 0, null, false)]);