fix 9610 (#11042)

zhengbli · web-flow · commit 3c4786d5427d · 2016-09-21T16:52:02.000-07:00
diff --git a/src/server/scriptVersionCache.ts b/src/server/scriptVersionCache.ts
@@ -526,7 +526,7 @@ namespace ts.server {
             }
             if (this.root.charCount() === 0) {
                 // TODO: assert deleteLength === 0
-                if (newText) {
+                if (newText !== undefined) {
                     this.load(LineIndex.linesFromText(newText).lines);
                     return this;
                 }

Original file line number	Diff line number	Diff line change
`@@ -526,7 +526,7 @@ namespace ts.server {`
`526`	`526`	`}`
`527`	`527`	`if (this.root.charCount() === 0) {`
`528`	`528`	`// TODO: assert deleteLength === 0`
`529`		`- if (newText) {`
	`529`	`+ if (newText !== undefined) {`
`530`	`530`	`this.load(LineIndex.linesFromText(newText).lines);`
`531`	`531`	`return this;`
`532`	`532`	`}`