handel completion on missing symbols correctelly

Author: mhegazy

src/compiler/checker.ts

@@ -2431,7 +2431,7 @@ module ts {
                 case SyntaxKind.Identifier:
                 case SyntaxKind.QualifiedName:
                     var symbol = getSymbolInfo(node);
-                    return getDeclaredTypeOfSymbol(symbol);
+                    return symbol && getDeclaredTypeOfSymbol(symbol);
                 default:
                     return unknownType;
             }
@@ -7077,7 +7077,7 @@ module ts {
 
             if (isTypeDeclarationName(node)) {
                 var symbol = getSymbolInfo(node);
-                return getDeclaredTypeOfSymbol(symbol);
+                return symbol && getDeclaredTypeOfSymbol(symbol);
             }
 
             if (isDeclaration(node)) {
@@ -7088,12 +7088,12 @@ module ts {
 
             if (isDeclarationOrFunctionExpressionOrCatchVariableName(node)) {
                 var symbol = getSymbolInfo(node);
-                return getTypeOfSymbol(symbol);
+                return symbol && getTypeOfSymbol(symbol);
             }
 
             if (isInRightSideOfImportOrExportAssignment(node)) {
                 var symbol = getSymbolInfo(node);
-                var declaredType = getDeclaredTypeOfSymbol(symbol);
+                var declaredType = symbol && getDeclaredTypeOfSymbol(symbol);
                 return declaredType !== unknownType ? declaredType : getTypeOfSymbol(symbol);
             }
 

src/services/services.ts

@@ -1810,12 +1810,13 @@ module ts {
 
             // Right of dot member completion list
             if (isRightOfDot) {
-                var type: ApparentType = typeInfoResolver.getApparentType(typeInfoResolver.getTypeOfNode(mappedNode));
-                if (!type) {
+                var type = typeInfoResolver.getTypeOfNode(mappedNode);
+                var apparentType: ApparentType = type && typeInfoResolver.getApparentType(type);
+                if (!apparentType) {
                     return undefined;
                 }
 
-                var symbols = type.getApparentProperties();
+                var symbols = apparentType.getApparentProperties();
                 isMemberCompletion = true;
                 getCompletionEntriesFromSymbols(symbols, activeCompletionSession);
             }