Fix case when position === 0

RyanCavanaugh · billti · commit c6e18a9fcf3a · 2016-02-04T11:28:37.000-08:00
(cherry picked from commit 1231c9e)
diff --git a/src/services/services.ts b/src/services/services.ts
@@ -5490,7 +5490,7 @@ namespace ts {
 
                     const nameTable = getNameTable(sourceFile);
 
-                    if (lookUp(nameTable, internedName)) {
+                    if (lookUp(nameTable, internedName) !== undefined) {
                         result = result || [];
                         getReferencesInNode(sourceFile, symbol, declaredName, node, searchMeaning, findInStrings, findInComments, result, symbolToIndex);
                     }

Original file line number	Diff line number	Diff line change
`@@ -5490,7 +5490,7 @@ namespace ts {`
`5490`	`5490`
`5491`	`5491`	`const nameTable = getNameTable(sourceFile);`
`5492`	`5492`
`5493`		`- if (lookUp(nameTable, internedName)) {`
	`5493`	`+ if (lookUp(nameTable, internedName) !== undefined) {`
`5494`	`5494`	`result = result \|\| [];`
`5495`	`5495`	`getReferencesInNode(sourceFile, symbol, declaredName, node, searchMeaning, findInStrings, findInComments, result, symbolToIndex);`
`5496`	`5496`	`}`