Compile error when class method has empty return

[gilbert]

Bug Report

Generating code for TemplateRoot node failed. Error: TypeError: Cannot read property 'type' of null

Context

class {
  subscribeToNewsletter (e) {
    return; // <-- The culprit
  }
}

<macro test(arg)>
  <p>${arg}</p>
</macro>

<div>
  <test('email') />
</div>

Additional Info

Your Environment

• Version used: v4.0.0
• Environment name and version (e.g. Chrome 39, node.js 5.4): node 6.9.1

Stack Trace

[marko-starter init] Error starting server. Error: Generating code for TemplateRoot node failed. Error: TypeError: Cannot read property 'type' of null
    at module.exports (/Users/tapwater/p/src/marko-issue/node_modules/raptor-util/createError.js:7:50)
    at CodeGenerator._invokeCodeGenerator (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/CodeGenerator.js:138:19)
    at CodeGenerator._generateCode (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/CodeGenerator.js:219:38)
    at CodeGenerator.generateCode (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/CodeGenerator.js:263:14)
    at Compiler.compile (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/Compiler.js:162:38)
    at _compile (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/index.js:89:33)
    at Object.compileFile (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/index.js:136:16)
    at loadFile (/Users/tapwater/p/src/marko-issue/node_modules/marko/runtime/loader/index-default.js:94:34)
    at doLoad (/Users/tapwater/p/src/marko-issue/node_modules/marko/runtime/loader/index-default.js:146:24)
    at load (/Users/tapwater/p/src/marko-issue/node_modules/marko/runtime/loader/index-default.js:5:16)
Caused by: TypeError: Cannot read property 'type' of null
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:24:20)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:206:32)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:15:33)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:59:28)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:120:28)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:199:29)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:15:33)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:188:34)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:102:24)
    at convert (/Users/tapwater/p/src/marko-issue/node_modules/marko/compiler/util/parseJavaScript.js:183:28)