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ng-xi18n regression 4.0.2 -> 4.0.3

See original GitHub issue

I’m submitting a … (check one with “x”)

[X] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

The compiler fails with the following error:

ng-xi18n -p src/tsconfig-i18n.json

TypeError: Cannot read property ‘toLowerCase’ of null at Extractor.serialize (…/node_modules/@angular/compiler-cli/src/extractor.js:44:32) at …/node_modules/@angular/compiler-cli/src/extractor.js:32:33 at process._tickCallback (internal/process/next_tick.js:109:7) at Module.runMain (module.js:606:11) at run (bootstrap_node.js:393:7) at startup (bootstrap_node.js:150:9) at bootstrap_node.js:508:3 Extraction failed

Expected behavior

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

Angular version: 4.0.3

Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]