Build: gulp.test.unit.js complains about missing map files when switching git branch #5610

[10:03:35] Starting '!broccoli.js.dev'...
removing outputs for angular2/src/compiler/legacy_template.ts
[10:03:35] '!broccoli.js.dev' errored after 541 ms
[10:03:35] Error: [DiffingTSCompiler]: ENOENT: no such file or directory, unlink '/Users/berchet/Code/angular/tmp/diffing_plugin_wrapper-cache_path-ls96kMtZ.tmp/angular2/src/compiler/legacy_template.js.map'
    at Error (native)
    at Object.fs.unlinkSync (fs.js:932:18)
    at DiffingTSCompiler.removeOutputFor (/source/broccoli/broccoli-typescript.ts:214:10)
    at /source/broccoli/broccoli-typescript.ts:86:12
    at Array.forEach (native)
    at DiffingTSCompiler.rebuild (/source/broccoli/broccoli-typescript.ts:81:27)
    at DiffingPluginWrapper.rebuild (/source/broccoli/diffing-broccoli-plugin.ts:104:39)
    at /Users/berchet/Code/angular/node_modules/broccoli/lib/api_compat.js:42:21
    at lib$rsvp$$internal$$tryCatch (/Users/berchet/Code/angular/node_modules/broccoli/node_modules/rsvp/dist/rsvp.js:493:16)
    at lib$rsvp$$internal$$invokeCallback (/Users/berchet/Code/angular/node_modules/broccoli/node_modules/rsvp/dist/rsvp.js:505:17)
    at /Users/berchet/Code/angular/node_modules/broccoli/node_modules/rsvp/dist/rsvp.js:1001:13
    at lib$rsvp$asap$$flush (/Users/berchet/Code/angular/node_modules/broccoli/node_modules/rsvp/dist/rsvp.js:1198:9)
    at doNTCallback0 (node.js:419:9)
    at process._tickCallback (node.js:348:13)