a8n: For some repositories `gitserver` cannot apply the diff

Created by: mrnugget

(I haven't gotten the chance to dig into this really far, but I wanted to capture it in a ticket sooner rather than later)

For some repositories the conversion from ChangesetJob to Changeset fails because gitserver cannot apply the diff:

06:42:03           gitserver | 2019/11/15 06:42:03 4 github.com/sd9/vue-native-core command [git apply --cached] failed (35.710484ms): exit status 1
06:42:03           gitserver | OUT: error: patch failed: dist/vue.min.js:3
06:42:03           gitserver | error: dist/vue.min.js: patch does not apply
06:42:03           gitserver | error: patch failed: dist/vue.observer.min.js:3
06:42:03           gitserver | error: dist/vue.observer.min.js: patch does not apply
06:42:03           gitserver | error: patch failed: dist/vue.react.min.js:3
06:42:03           gitserver | error: dist/vue.react.min.js: patch does not apply
06:42:03           gitserver | error: patch failed: dist/vue.runtime.min.js:3
06:42:03           gitserver | error: dist/vue.runtime.min.js: patch does not apply