Fix edge case for non-exported variable declaration aliases for exported globals.

Closes #560.

src/Module.js

@@ -189,7 +189,7 @@ export default class Module {
 			const declaration = this.declarations[ name ];
 			const statement = declaration.statement;
 
-			if ( statement.node.type !== 'VariableDeclaration' ) return;
+			if ( !statement || statement.node.type !== 'VariableDeclaration' ) return;
 
 			const init = statement.node.declarations[0].init;
 			if ( !init || init.type === 'FunctionExpression' ) return;

test/form/import-named-exported-global-with-alias/_config.js

@@ -0,0 +1,6 @@
+module.exports = {
+	description: 'allow globals to be exported and imported',
+	options: {
+		moduleName: 'doc'
+	}
+};

test/form/import-named-exported-global-with-alias/_expected/amd.js

@@ -0,0 +1,5 @@
+define(function () { 'use strict';
+
+
+
+});

test/form/import-named-exported-global-with-alias/_expected/cjs.js

@@ -0,0 +1,2 @@
+'use strict';
+

test/form/import-named-exported-global-with-alias/_expected/iife.js

@@ -0,0 +1,6 @@
+(function () {
+	'use strict';
+
+
+
+}());

test/form/import-named-exported-global-with-alias/_expected/umd.js

@@ -0,0 +1,9 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(factory());
+}(this, function () { 'use strict';
+
+
+
+}));

test/form/import-named-exported-global-with-alias/browser.js

@@ -0,0 +1 @@
+export { document };

test/form/import-named-exported-global-with-alias/main.js

@@ -0,0 +1,2 @@
+import { document } from './browser.js';
+var d = document;