debug: only use : after name if there is a value

fixes #9775

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

@@ -257,7 +257,7 @@ export abstract class ExpressionContainer implements debug.IExpressionContainer
 						const numberOfChunks = this.indexedVariables / ExpressionContainer.CHUNK_SIZE;
 						for (let i = 0; i < numberOfChunks; i++) {
 							const chunkSize = Math.min(ExpressionContainer.CHUNK_SIZE, this.indexedVariables - i * ExpressionContainer.CHUNK_SIZE);
-							const chunkName = `${i * ExpressionContainer.CHUNK_SIZE}..${i * ExpressionContainer.CHUNK_SIZE + chunkSize - 1}`;
+							const chunkName = `${i * ExpressionContainer.CHUNK_SIZE} \u2026 ${i * ExpressionContainer.CHUNK_SIZE + chunkSize - 1}`;
 							childrenArray.push(new Variable(this, this.reference, chunkName, '', null, chunkSize, null, true, i));
 						}
 

src/vs/workbench/parts/debug/electron-browser/debugViewer.ts

@@ -71,11 +71,12 @@ export function renderExpressionValue(expressionOrValue: debug.IExpression | str
 
 export function renderVariable(tree: tree.ITree, variable: model.Variable, data: IVariableTemplateData, showChanged: boolean): void {
 	if (variable.available) {
-		data.name.textContent = variable.name + ':';
+		data.name.textContent = variable.name;
 		data.name.title = variable.type ? variable.type : '';
 	}
 
 	if (variable.value) {
+		data.name.textContent += ':';
 		renderExpressionValue(variable, data.value, showChanged, MAX_VALUE_RENDER_LENGTH_IN_VIEWLET);
 		data.value.title = variable.value;
 	} else {
@@ -884,8 +885,9 @@ export class WatchExpressionsRenderer implements tree.IRenderer {
 		}
 		data.actionBar.context = watchExpression;
 
-		data.name.textContent = `${watchExpression.name}:`;
+		data.name.textContent = watchExpression.name;
 		if (watchExpression.value) {
+			data.name.textContent += ':';
 			renderExpressionValue(watchExpression, data.value, true, MAX_VALUE_RENDER_LENGTH_IN_VIEWLET);
 			data.name.title = watchExpression.type ? watchExpression.type : watchExpression.value;
 		}